Biotin and Collagen: Which Is The Best For You?

Medically reviewedby Dr. Amy Revene M.B.B.S.
WrittenbyLuat Duong
Last updated

The whole industry is talking about the benefits of biotin and collagen, and it seems that everyone’s including them as an integral part of their hair health routines. But are either of them going to make a palpable difference in alleviating your hair health concerns?

Both of them promise faster hair growth, amazing skin benefits and some even claim to reverse aging and hair loss. But is there any truth to these claims?

And more importantly, which of them really does help your hair growth?

Today we’re removing the ambiguity and diving into the science behind both of these ingredients. Starting with what they are, how they differ from each other, and what hair concerns each of them target best, we’ve got you covered if you’re trying to figure out which one to choose—or whether to choose at all.

What is biotin?

Biotin is another name for vitamin B7 or Vitamin H. This vitamin’s most important function is that it helps your body convert food into energy, but it also helps with the health of your:

  • Hair
  • Skin
  • Nails
  • Eyes
  • Nervous system
  • Pregnancies

Most people get enough biotin through their diets, as it’s rife in common foods such as:

  • Organ meats
  • Eggs
  • Legumes
  • Nuts
  • Seeds

If you’re eating a varied, balanced diet, you most probably don’t need to worry about not getting enough of it. In fact, biotin supplements aren’t targeting people with a biotin deficiency, as there are very few of those.

The theory is that a surplus of biotin in your body is desirable, as it’s speculated that it will get your hair, skin, and nails to be even healthier.

Why you can trust Scandinavian Biolabs?
TrichoAI Hair Loss Analysis
Our free, anonymous and dermatologist-developed AI analyzes your hair loss in 30 seconds, suggesting personalized solutions to combat thinning. Understanding your hair condition has never been easier.
Yes, I want to fix hair loss

What does biotin do for hair?

Biotin is the essential building block of keratin, the primary protein in hair. A deficiency of biotin negatively affects hair growth due to the lack of keratin.

There are a lot of supplements that claim to improve hair health, and although biotin is one of them, there doesn’t seem to be enough research about the role of supplementing biotin in hair growth and overall texture.

It can’t be stated that biotin supplements are 100% verified and effective for hair growth—unless if they’re helping remove a biotin deficiency, in which case the supplements will definitely help with their hair growth.

In some studies, biotin supplements have even been reported to reverse hair loss, but they’ve failed to be successfully isolated from other ingredients, so it’s hard to say if it was biotin that had the biggest impact.

If you’d like to read more about these studies and what they found, feel free to go ahead and read our other article on biotin for hair.

While biotin’s crucial role in keratin seems reason enough for making sure that we have appropriate levels of it in our bodies, we should approach supplements with care.

Read more: Can Men Take Biotin?

What is collagen?

collagen supplements


Collagen is the most abundant protein in the human body. Just like biotin, it plays a crucial role in the functioning of our bodies, as it provides them with structural support.

It might be easier for you to imagine collagen as the springs in a mattress - if your body is the metaphorical mattress, collagen is the internal structure that keeps it in place, firm, and bouncy.

You can find collagen all over your body, but most of it is within your skin, bones, tendons, and cartilages.

When we’re younger, we have plenty of collagen reserves that we build through our varied diets.

Some great foods for collagen are:

  • Fish
  • Chicken
  • Egg whites
  • Citrus fruits
  • Berries
  • Vegetables (tomatoes, spinach, kale, etc.)

What does collagen do for hair?

As we grow older, our collagen reserves dwindle, making those springs a little bit less bouncy and the support less sturdy. Think about how older people’s skin sags; that’s because, amongst other things, they’re missing collagen.

A shortage of collagen also affects hair, making it sparse, thin, and brittle.

What’s the link? Simple.

Collagen and keratin are both proteins, and all proteins are made out of smaller building blocks called amino acids.

Proline happens to be one of the main amino acids in both collagen and keratin; when your hair is in its growth phase, there is naturally more proline in your scalp.

Low collagen means low proline levels, which means impeded hair growth. You can find out more in our separate deep dive into collagen for hair growth.

Read more: Does Collagen Help Hair Loss? What You Need to Know (2022)

What’s the best way to take biotin and collagen for hair?

woman reading magazine after shampoo

Biotin and collagen seem to both have the same effect: they help hair growth. By supporting keratin, the primary protein in the structure of hair, they are doing their part in boosting overall hair health.

But when it comes to taking supplements or applying topical treatments for either of these in the form of shampoos or serums, the story becomes a little bit different.

Biotin and collagen supplements work in a similar way. Your body breaks them down into its building blocks.

If everything goes according to plan and your body absorbs it properly and directs it towards the area that you’d like for it to help with (in our case, your scalp), then you’re bound to reap the benefits of your biotin and collagen supplement.

Topical application, however, is different.

Collagen is an easy one to explain: a collagen molecule is simply too big to penetrate the skin (your scalp). So, even if you’ve got the highest quality collagen-boosted shampoo or treatment, chances are that your shower water will wash it right off your hair and into the drain, along with your money.

[[quote]]Collagen in topical application doesn’t work. Biotin, on the other hand, does well when applied directly to your hair.[[quote]]

Unlike collagen, biotin can be successfully absorbed through the skin and scalp, and if applied regularly, it will increase the levels of biotin present in your hair, rehydrating the scalp and unclogging the pores of the dead skin cells. This will help your hair with its natural growth cycle.

The Hair Nutrient supplement with guaranteed results

Statistics show that around 81% of women believe that having luscious, thick and smooth hair is the pride and joy for many.

Biotin and collagen supplements can help you achieve those goals but not all hair supplements are built the same.

Some don't work, some are unsafe, and some are just extortionate. So which hair supplement really does the job?

Scandinavian Biolabs' Hair Nutrient Tablets is all THAT (and more)!

Besides having biotin, these Hair Nutrient Tablets are 100% vegan and contain naturally derived, hair growth-boosting ingredients like:

  • Amino acid complex - enhances proteins, specifically keratin, the main structure in hair.
  • Zinc - compensates for zinc deficiencies that disrupt normal hair growth cycles
  • Apple extract - encourage hair epithelial cell growth
  • Horsetail extract - increases the tensile strength of hair.

Hair Nutrient Tablets
Hair Nutrient Tablets
Contains zinc for the maintenance of normal hair, as well as niacin and riboflavin for the maintenance of normal skin.

When coupled with the Hair Growth Routine, we guarantee results - or all your money back.

Biotin or collagen: which supplement should you take?

We made a handy table to compare the main features of each, allowing you to make an informed choice:

Feature Biotin Collagen
Main benefits Promotes hair growth and nail health Improves skin elasticity and joint health
Source Can be plant-based, found in foods such as eggs, nuts, and fish No plant-based source available, derived from animal bones and connective tissue
Dosage Daily recommended dose ranges from 30-100 mcg Daily recommended dose ranges from 2.5-15 grams
Potential side effects May cause acne breakouts May cause digestive issues
Other benefits Can help support metabolism and cognitive function Can improve gut health and reduce inflammation
Effectiveness Mixed results in scientific studies Some evidence for improved skin and joint health
Cost Typically less expensive Generally more expensive
Accessibility Widely available in supplement form Can be harder to find in supplement form


Read more: Top 7 Foods For Vegetarian Hair Growth According To Doctors

Over-reliance on supplements

Over-reliance on supplements for hair health can have potential downsides. While supplements can provide certain nutrients that are beneficial for hair health, relying too much on them can result in imbalanced nutrient intake or even overdose, which may lead to negative side effects.

Moreover, some supplements may interact with medications or cause allergic reactions, which could further harm one's health.


Luat Duong

Luat Duong is a Copenhagen-based writer and content strategist specializing in hair loss and health. His work has been featured in MyHealthGuide, The Right Hairstyles, and Woman's Era. He is a graduate of Vaasa University. You can connect with him on LinkedIn.