Getting a hair growth serum is a common practice if you're looking for faster hair growth. Many hair growth products claim to give you thick hair and scalp nourishment, but how do you know which ones are worth your money?
And what is this hair growth serum for men and hair growth serum for women, do they really make a difference?
In this article, we discuss the best hair growth serums on the market. Whether you need to fix split ends, thicken a thinning crown, or add hairline, there's a hair regrowth serum for you.
What is a hair growth serum?
A hair growth serum is a specially formulated hair care product designed to stimulate and support healthy hair growth. Enriched with essential nutrients, vitamins, and natural extracts, these serums work by nourishing the scalp and hair follicles, promoting stronger and longer hair. Hair growth serums are ideal for those experiencing hair loss, thinning, or simply wanting to enhance their hair's natural growth.
Do hair growth serums work?
Yes, hair growth serums can work effectively to improve hair growth, thickness, and overall hair health. However, results may vary depending on the individual, the quality of the serum, and consistent application. It is essential to choose a reputable hair growth serum with proven ingredients and follow the manufacturer's instructions for optimal results.
Is there any scientific research on hair serums for hair growth?
There is scientific research supporting the use of certain ingredients in hair growth serums, such as minoxidil, biotin, and caffeine. These ingredients have been shown to stimulate hair growth, improve hair strength, and reduce hair loss in various studies. However, more research is needed to understand the efficacy of different formulations and their long-term effects.
According to a study published in the Journal of Cosmetic Dermatology, a hair growth serum containing 5% minoxidil and 0.01% tretinoin was found to be effective in promoting hair growth in women with androgenetic alopecia. The study showed that after 24 weeks of using the hair growth serum for alopecia, the serum led to significant improvement in hair density and thickness.
Another study published in the International Journal of Trichology found that a hair growth serum containing biotin, niacinamide, and panthenol was effective in promoting hair growth and reducing hair shedding in men and women with androgenetic alopecia. The study showed that after 12 weeks of hair loss treatment, the serum led to a significant increase in hair count and thickness.
How did we rank?
We rank the best hair growth serums based on several factors, including the effectiveness of their formulas, positive hair growth serum reviews, safety of ingredients, and overall value for money.
What are the best hair growth serums for healthy hair growth?
The best hair growth serums for healthy hair growth contain a combination of proven ingredients, such as biotin, caffeine, minoxidil, and natural extracts like rosemary and pumpkin seed oil.
These hair growth serum ingredients work together to nourish the scalp, stimulate hair follicles, and promote hair growth.
Let's discuss the top-rated hair growth serums below:
1. Best overall: Bio-Pilixin Activation Serum
The Bio-Pilixin Activation Serum by Scandinavian Biolabs, a hair care solution designed for men and women that has undergone rigorous research and evaluation.
The key active ingredient, Capilia Longa, has been meticulously tested in clinical studies and laboratory settings, proving its capability to realign the hair growth cycle.
Over a period of 150 days, a significant 73% of users witnessed a measurable increase in hair density, lending credibility to the serum's performance. Moreover, the drug-free composition alleviates the concern of harmful side effects.
Scandinavian Biolabs acknowledges the doubts that come with trying a new product, which is why they offer a 150-day money-back guarantee. This allows you to try the Bio-Pilixin Activation Serum without financial risk.
This product is a suitable option for those who are cautious about hair care solutions but are still interested in exploring a product backed by research.
Pros:
- Results supported by research within 150 days
- Aims to help reduce hair loss and improve hair growth
- Safe experience with a money-back guarantee
- A cost-effective solution with promising results
- Help you achieve fuller, denser hair appearance
- 100% botanical, plant-powered formula without hazardous side effects
Cons:
- Limited stock due to high demand and curiosity
How to use: Apply a few drops to clean, towel-dried hair, focusing on the scalp. Gently massage in circular motions for 1-2 minutes. Do not rinse. Use daily for best results.
Key ingredients: Peptides, Vitamin E, Biotin, Amino Acids
Hair type: All hair types, especially those experiencing hair loss or thinning
Size: 100 ml
2. Best multipurpose: The Ordinary Multi-Peptide Serum
Peptides are the essential amino acids that help the hair grow and get stronger, among other things. For example, the Ordinary Multi-Peptide Serum for Hair Density contains peptides like CAPIXYL and Procapil, which both help hair grow and stop hair loss simultaneously. It also makes the nails and scalp stronger.
Pros:
- Absorbs quickly
- Light fragrance
- Easy to use
Cons:
- No guarantee
- Feels heavy and greasy on the scalp
How to use: Apply a few drops to clean, damp scalp once daily, preferably at bedtime. Massage gently and thoroughly until absorbed. Do not rinse.
Key ingredients: Peptides, Biotin, Caffeine, Hyaluronic Acid
Hair type: All hair types, especially those experiencing hair loss or thinning
Size: 60 ml
3. Best scent: Camille Rose Ultimate Growth Serum
Utilizing this hair growth serum for women, your hair follicles become unclogged, and your scalp is invigorated by the power of amla oil and Brahmi herbs.
A blend of sesame and coconut oils provides fortification and hydration, minimizing the chances of hair breakage.
Not only will you enjoy long and stunning hair after using this hair growth serum for thinning hair, but you'll also delight in the enticing aroma of chocolate and honey. Plus, it doesn't leave your scalp feeling oily.
Sesame and coconut oils are harmoniously combined with golden jojoba and olive fruit extracts, forming a nourishing oil concoction that delivers a burst of deep hydration.
This rejuvenating hair elixir features amla oil, renowned for its conditioning effects on the scalp, and Brahmi herbs, known for their ability to clear hair follicles and stimulate healthy hair growth and blood circulation.
Pros:
- Smells great
- Best for regrowth
- Easy to use daily
Cons:
- Feels very greasy
How to use: Apply a small amount to the scalp and massage gently. Can be used daily or as needed.
Key ingredients: Biotin, Castor Oil, Aloe Vera, Tea Tree Oil
Hair type: All hair types, especially dry and damaged hair
Size: 240ml
4. Best texture: SheaMoisture Jamaican Black Castor Oil Hair Serum
If you want to restore your hair to health and maximize its potential for length, Jamaican Black Castor Oil is a tried-and-true solution. SheaMoisture has created a special oil serum formulated to encourage hair growth for curly, wavy hair. In addition, this enhanced composition is ideal for frizz control, although it works well on all hair types.
Those who routinely use straightening irons, perms, or other heat hair tools may benefit greatly from this concentrated oil serum. Its high concentration of moisturizing ingredients allows it to penetrate deeply, treating the scalp and each hair strand with minerals, nutrients, and vitamins to revive hair that has been damaged or chemically treated.
This best hair growth serum helps sustain healthy, lustrous hair and increases resistance to breakage by thickening and moisturizing hair. The stimulating effects of peppermint on the scalp are another perk.
Pros:
- Soft and smooth texture
- Moisturizes well
- Non-greasy
Cons:
- Expensive
How to use: Apply a small amount to the scalp and massage gently. Can be used daily or as needed.
Key ingredients: Jamaican Black Castor Oil, Shea Butter, Peppermint Oil
Hair type: All hair types, especially curly and coily hair
Size: 59ml
5. Best for hair thickness: Nutrafol Growth Activator Hair Serum
In addition to making hair appear thicker and healthier, the nutrient-rich elements in the best hair growth serum also reduce breakage and nourish, moisturize and revitalize the scalp, all of which are necessary for healthy hair renewal.
Pros:
- Increase hair thickness visibly
- Strengthen your hair by minimizing breakage
- Keep your scalp hydrated and nourished
Cons:
- No guarantee
- Makes your hair greasy
How to use: Apply 1-2 pumps to clean, towel-dried hair, focusing on the scalp. Gently massage in circular motions. Do not rinse. Use daily for best results.
Key ingredients: Red Clover, Saw Palmetto, Biotin, Panthenol
Hair type: All hair types, especially those experiencing hair loss or thinning
Size: 50 ml
6. Best budget: The Inkey List Caffeine Stimulating Scalp Treatment
This treatment is cheap. It has a strong dose of caffeine powder to wake up your hair follicles. It did well in lab tests for making hair thicker, and our testers liked how it reduced hair loss and made hair look healthier. Everyone got rid of those pesky flakes, and people with colored hair were impressed by how much brighter their hair looked.
Pros:
- Silicone free
- Suitable for all hair types
Cons:
- Can cause hair damage
- It needs to apply for overnight
How to use: Apply 1-2 pumps to clean, towel-dried hair, focusing on the scalp. Gently massage in circular motions. Do not rinse. Use daily for best results.
Key ingredients: Red Clover, Saw Palmetto, Biotin, Panthenol
Hair type: All hair types, especially those experiencing hair loss or thinning
Size: 50 ml
7. Best for frizz: Actsyl-3 Hair Growth Serum
Biochanin A, another ingredient, inhibits the formation of DHT, thus halting hair loss and preventing breakage. In addition, hair growth is stimulated by DHQG and EGCG2, two ingredients in the serum that are also absorbed quickly.
Therefore, this best hair growth serum is quickly absorbed and does not leave any sticky residue, allowing your hair to retain its natural, healthy appearance.
Pros:
- Cruelty-free
- Paraben-free
- Anti-frizz
- Non-greasy
Cons:
- Intense bad smell
- DHT blocker has contradicting research
How to use: Apply a few drops to clean, towel-dried hair, focusing on the scalp. Gently massage in circular motions. Do not rinse. Use daily for best results.
Key ingredients: Redensyl, Capixyl
Hair type: All hair types, especially those experiencing hair loss or thinning
Size: 30ml
8. Best for great volume: Advanced Trichology Nutra M Melatonin Hair Growth Serum
Extensive clinical testing has been conducted on Advanced Trichology's Nutra M Melatonin Hair Growth Serum. The hair loss brought on by tension, dihydrotestosterone (DHT), or inflammation is reversed. The proprietary blend in this fragrance-free serum promotes hair growth and calms inflamed scalps.
Herbal ingredients like green tea and licorice root are included in the formula to improve circulation and promote growth. Grapefruit seed extracts add moisture and shine, and black cohosh reduces hair loss. The serum's niacin and melatonin ingredients both work to thicken and speed up hair growth.
Pros:
- Gluten-free
- Cruelty-free
- Vegan
- Clinically-tested
- DHT blocker
Cons:
- DHT blocking might cause side effects
- It may cause little redness
How to use: Apply a few drops to clean, towel-dried scalp at bedtime. Massage gently until absorbed. Do not rinse.
Key ingredients: Melatonin, Panthenol, Biotin, Saw Palmetto
Hair type: All hair types, especially those experiencing hair loss or thinning
Size: 50ml
9. Best for dandruff removal: Cristalbox Biotin Hair Regrowth Serum
Grapeseed oil, an ingredient in this organic hair growth serum, has antioxidant properties; it also helps seal moisture and adds shine to your hair. As a result, hair nutrition is enhanced, and a protective layer is formed, thanks to ginseng. Add two to three drops to your regular shampoo, rub your scalp and hair for five minutes, and then rinse.
Pros:
- Anti-dandruff
- Non-greasy
- Natural ingredients
- Anti-frizz
Cons:
- Absorbs slowly
How to use: Apply a few drops to clean, towel-dried hair, focusing on the scalp. Massage gently in circular motions. Do not rinse. Use daily for best results.
Key ingredients: Biotin, Ginseng Extract, Argan Oil
Hair type: All hair types, especially those experiencing hair loss or thinning
Size: 30ml
10. Best for unhealthy hair: Beaueli Hair Growth Serum
The Beaueli Hair Growth Serum is the solution. Biotin oil, found in one of the best hair serum for growth, has been shown to reduce hair thinning and promote healthier hair. It helps brittle hair become stronger and grow out more quickly. It can be applied quickly and efficiently even to damp hair, increasing absorption rate and eliminating the risk of any residue being left behind on the scalp.
Since it contains argan oil, it will keep your hair and scalp hydrated and less susceptible to damage from daily use, thus preventing hair loss. Also, this serum's active ingredient, castor oil, make hair more flexible, lubricates the hair shaft, and reduces breakage.
Pros:
- Absorbs well
- Anti-dandruff
- Hydrating
Cons:
- It may irritate the eyes
How to use: Apply a few drops to clean, towel-dried hair, focusing on the scalp. Massage gently in circular motions. Do not rinse. Use daily for best results.
Key ingredients: Biotin, Panthenol, Castor Oil, Aloe Vera
Hair type: All hair types, especially those experiencing hair loss or thinning
Size: 60 ml
11. Best for damaged hair: Vitaoil Biotin Hair Serum
Hair loss is treated, and strength is increased with the help of Vitaoil Biotin Hair Serum. The special botanical combination makes hair thick and shiny. Aloe vera and argan oil are also included to hydrate the hair and make the volume more manageable.
The best hair growth serum contains vitamin E and biotin, which shield your hair from the damaging effects of the sun, pollution, and other environmental factors. If you're a hair or a woman struggling with hair damage, dryness, or dullness, this is your product.
Pros:
- Anti-frizz
- Natural ingredients
- Dairy-free
Cons:
- Strong smell
How to use: Apply a few drops to clean, damp hair, focusing on the scalp. Massage gently in circular motions. Do not rinse. Use daily for best results.
Key ingredients: Biotin, Argan Oil, Keratin, Vitamin E
Hair type: All hair types, especially dry and damaged hair
Size: 60ml
12. Best growth booster: Monpure Follicle Boost Hair Density Serum
Research has shown that the pumpkin seed extract featured in this revolutionary serum can stop hair from thinning or falling out altogether. This effect is achieved by inhibiting 5-alpha reductase, an enzyme responsible for producing chemicals that shorten the hair's anagen phase and hasten its transition into the shedding phase.
AHAs eliminate dirt and tiny particles by dissolving the "glue" that holds dead skin cells together. It clears out the hair follicles, allowing hair development to proceed unimpeded. The skin's pH is lowered from 5.5 to 3, a process triggered by these AHAs, signaling the dermal layers to begin producing healthy new cells.
The best hair growth serum's other active components, such as pumpkin seed extract, are more absorbed and stimulate the scalp because retinyl palmitate, a mild retinol, speeds up cell turnover.
Pros:
- No sulfates
- No silicones
- Suitable for vegans and vegetarians
- Prevents hair loss and thinning
Cons:
- Doesn’t work for an itchy scalp
- Most expensive on this list
How to use: Apply a few drops to clean, towel-dried scalp. Massage gently in circular motions until absorbed. Do not rinse. Use daily or as needed.
Key ingredients: Pumpkin Seed Extract, Castor Oil, Peptides, Biotin
Hair type: All hair types, especially those with slow growth or thinning
Size: 50 ml
13. Best for very thin hair: Vegamour GRO Hair Serum
You'll see broad-spectrum hemp in Vegamour's innovative new solution, which boasts the same potent actives as one of the best hair growth serum. This anti-aging combination will help you take charge of your graying hair using effective yet gentle compounds derived from plants.
Pros:
- Vegan
- Natural
- Effective product for precise applications
Cons:
- Users reported irritation
- Expensive
How to use: Apply a few drops to clean, towel-dried scalp. Massage gently in circular motions until absorbed. Do not rinse. Use daily for best results.
Key ingredients: Mung Bean Extract, Red Clover Extract, Biotin, Zinc
Hair type: All hair types, especially those experiencing hair loss or thinning
Size: 30ml
14. Best for curly hair: Curlsmith Scalp Stimulating Booster
This mixture of soy and ginger was made with curls in mind. It is meant to reshape your locks and coils and make your hairline look and feel fuller.
One tester said that their hair is now "so soft and shiny and feels much fuller and stronger," and most of the panel was happy to see less hair fallout. Most people saw a boost in volume, and many saw their hair get thicker and better hydrated.
Pros:
- Vegan
- Paraben free
- Affordable price
Cons:
- Strong smell
How to use: Apply a few drops to clean, towel-dried scalp. Massage gently in circular motions until absorbed. Do not rinse. Use daily for best results.
Key ingredients: Peppermint Oil, Rosemary Oil, Caffeine, Biotin
Hair type: Curly, coily, and wavy hair types, especially those with slow growth or thinning
Size: 2.0 oz
15. Best selling on Amazon: Wild Hair Growth Oil
This unique blend of olive oil, coconut oil, and lavender was crafted specifically for revitalizing and stimulating hair growth in curly, coily, and wavy hair. Designed to transform your locks and promote a fuller, healthier hairline, this oil has garnered rave reviews from users.
One satisfied customer reported that their hair has become "incredibly soft, shiny, and noticeably fuller and stronger," while most users experienced a significant decrease in hair fallout. Many customers noticed an increase in volume, and several observed that their hair was thicker and more moisturized.
Pros:
- Natural ingredients
- Suitable for all curly hair types
- Affordable price
Cons:
- Some users may find the scent too strong
How to use: Apply a few drops to clean, towel-dried scalp. Massage gently in circular motions until absorbed. Do not rinse. Use daily for best results.
Key ingredients: Olive Oil, Coconut Oil, Lavender Oil, Jojoba Oil
Hair type: Curly, coily, and wavy hair types, especially those with slow growth or thinning
Size: 118ml
How to maximize hair growth serum results?
To maximize hair growth serum results, follow these hair growth tips:
- Apply the serum correctly
- Derma-rolling
- Maintain a healthy diet and lifestyle
- Avoid heat styling tools and harsh chemicals
- Use hair growth supplements
- Consider using a hair growth serum in conjunction with other hair care products designed to support hair health (such as shampoo and conditioner)
- Keep split ends trimmed
- Sleep on a silk pillowcase
Apply it correctly
Applying a hair serum correctly is an important step in achieving healthy and vibrant looking hair.
When applied correctly, serums can help to repair damage, add shine, and protect against further damage. Here are some pro tips for how to use hair growth serum:
- Start with clean, dry hair. Wet hair will not absorb the serum as well and will make it difficult to evenly distribute the product.
- Apply a small amount of serum to your palms and rub them together.
- Start at the ends of your hair and work your way up to the roots. Use your fingers to work the serum through your hair, paying extra attention to any areas that are particularly dry or damaged.
- Do not rinse out the serum. Instead, style your hair as usual.
With these simple tips, you can ensure that your hair care serum is working its best. When in doubt, follow the instructions on the label.
Remember to be gentle with your hair and avoid using excessive heat or chemicals, as this can undo the beneficial effects of the serum.
Try derma-rolling
Using a derma roller can maximize hair growth serum results by enhancing the absorption of the serum into the scalp and stimulating hair follicles. A derma roller is a handheld device with small needles that create microchannels in the skin when rolled over the scalp.
The micro-channels created by a derma roller can enhance the absorption of hair growth oil or serum into the scalp, thus providing the hair follicles with essential nourishment that encourages healthier hair growth.
Moreover, the action of a derma roller can boost blood circulation in the scalp. This improved circulation delivers critical nutrients and oxygen to the hair follicles, which are key components for the promotion of robust hair growth.
The tiny needles on the derma roller also help to exfoliate the scalp, removing dead skin cells and buildup that can clog hair follicles and inhibit hair growth.
By combining the use of a hair growth serum with a derma roller, you can enhance the effectiveness of the serum and promote healthy hair growth. However, it's important to use the derma roller correctly to avoid damaging the scalp or hair follicles.
Always follow the manufacturer's instructions and consult with a healthcare professional before using a derma roller on your scalp.
Eat a balanced diet
Eating your way to longer hair is the better, nutritionist-recommended approach to speeding up hair growth.
It's easier for your body to absorb vitamins and minerals from whole foods than from supplements. This means they will provide a more optimal balance of nutrients, just as nature intended.
Increased consumption of good fats, such as omega-3s, has stimulated hair growth. Because the human body cannot create omega-3 fatty acids on its own, eating foods rich in these fats is crucial for maintaining healthy hair.
Therefore, we need to ensure that our diet includes these fats. They strengthen hair follicles and impart a healthy sheen to strands.
Ultilize hair growth supplements
Hair growth products like serums and supplements can help improve your hair's overall health and appearance. While it's undeniable that eating a diet that has hair growth vitamins like biotin and vitamin D are better for your health, there are times where we appreciate and need the convenience of supplements.
Keep split ends trimmed
You'd think it would be unhelpful if you were trying to grow your hair. But on the other hand, regular trims get rid of dry, damaged split ends and are essential for healthy development. Leave those split ends alone, and they'll work their way up the hair strands, causing even more breakage, and all that will grow is your irritation.
Suppose you walk in without communicating your hair objectives to your hairdresser. In that case, they may keep cutting off too much length at each session, preventing your hair from growing.
There's no hard and fast rule about how often you should get a haircut; it depends on your hair's condition, style, and how often you wash and style it. However, the fewer you'll need cuts and the longer your hair can grow naturally, the better you care for your hair daily.
Sleep on a silk pillowcase
Instead of using cotton to absorb all the moisture from your hair and cause knots and breakage, switch to a silk cover or pillowcase. Sleeping with a silk pillowcase reduces friction, which may help hair grow faster but is not guaranteed. In addition, a softer surface is better for hair to rest on.
Hair growth serum FAQs
What ingredients should there be in a hair growth serum?
A high-quality hair growth serum should contain ingredients such as minoxidil, biotin, caffeine, and natural extracts like rosemary and peppermint oil. These ingredients have been proven to stimulate hair growth, improve hair strength, and reduce hair loss:
- Biotin: Biotin is a B-vitamin that is essential. Biotin for hair growth is a popular ingredient found in many hair care products, as it strengthens hair and stimulates growth.
- Caffeine: Caffeine hair growth products stimulate hair follicles, increasing blood flow and encouraging growth. It may also help to inhibit the effects of DHT, a hormone that can contribute to hair loss.
- Niacin: Niacin is a B-vitamin that can help to improve blood circulation to the scalp and promote healthy hair growth.
- Keratin: Keratin is a protein that is a major component of hair. It can help to strengthen hair strands and prevent breakage.
- Peptides: Peptides are small protein molecules that can help to stimulate hair growth by promoting the production of collagen and elastin in the scalp.
- Castor oil: Castor oil is rich in ricinoleic acid, which has been shown to promote hair growth and prevent hair loss.
- Saw palmetto: Saw palmetto is a plant extract that may help to inhibit the effects of DHT, a hormone that can contribute to hair loss.
- Ginseng: Ginseng is a plant extract that can improve blood circulation to the scalp and promote healthy hair growth.
- Minoxidil: Minoxidil hair growth products have been clinically proven to help reduce hair loss and promote regrowth.
How do you know what hair growth serum is working?
To determine if a hair growth serum is working, monitor your hair for improvements in thickness, length, and overall health.
Visible results may take time, so be patient and consistent with the application. Additionally, read customer reviews, testimonials and hair growth serum before and after photos can help you gauge the effectiveness of a product and decide if it's right for you.
But, in general, these are signs that it's working:
- Reduced hair shedding: If you notice less hair falling out when you brush or wash your hair, this may be a sign that the serum is working to strengthen your hair strands and reduce breakage.
- Increased hair thickness: As your hair grows, you may notice that your hair strands are thicker and fuller.
- New hair growth: If you were experiencing hair loss or thinning, you may begin to see new hair growth in areas where hair was previously thinning or falling out.
How often should you use it?
Follow the manufacturer's instructions for using a hair growth serum, as the frequency may vary depending on the formulation. Generally, hair growth serums are applied daily or every other day to ensure consistent benefits.
How much should you spend on a hair growth serum?
According to a survey conducted by Statista, the average price of a hair growth serum in the United States is around $25-30 per bottle.
While a higher price doesn't necessarily guarantee better results, it's important to choose a product that contains high-quality, effective ingredients. It's also important to consider factors such as the size of the bottle, the frequency of use, and the duration of treatment when comparing the cost of different hair growth serums.
Who can benefit from using hair serums for hair growth?
Individuals experiencing hair loss, thinning, or slow hair growth can benefit from using hair growth serums. Additionally, those looking to improve their hair's overall health, strength, and appearance may also find hair growth serums helpful.
What are hair growth serum side effects?
While hair growth serums are generally safe to use, some potential side effects and precautions should be considered. Side effects may include scalp irritation, redness, itching, and allergic reactions.
What precaution to take before using hair serums for hair growth?
Before using a hair growth serum, take these precautions:
- Perform a patch test to check for potential allergic reactions or skin sensitivities.
- Consult with a healthcare professional or dermatologist if you have an existing scalp condition or are taking medications that may interact with the hair growth serum ingredients.
- Read and follow the manufacturer's instructions carefully to ensure proper application and usage.
- Monitor your hair and scalp for any adverse reactions, and discontinue use if irritation occurs.
- Be patient and give the hair growth serum time to work, as visible results may take several weeks or months to appear.
Conclusion
Remember that hair growth serums aren't a magic bullet despite their name. If you are experiencing significant hair loss, it is recommended that you ultilize hair restoration treatment instead for hair regrowth.
Try to follow a healthy diet. A well-balanced diet that includes the full spectrum of macro and micronutrients is the best and most sustainable way of supporting healthy hair growth.
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