By Steve Haymes, Founder of Biotin Xtreme Hair Care & Cuts Inc. — Hair Loss and Hair Care Specialist, 40+ years of salon experience, Named Best of Atlanta by CBS News
Biotin and keratin get lumped together constantly — "biotin vs. keratin," "keratin and biotin shampoo," "biotin keratin shampoo" — but they're not competing versions of the same thing. Biotin is a vitamin your body uses to help build keratin; keratin is the structural protein that already makes up your hair. A biotin shampoo and a keratin shampoo are built to do different jobs — one supports the hair you're growing, the other treats the hair you already have. Here's the real difference between keratin and biotin, what's misleading about a lot of the marketing around them, and which one fits your situation.
Is Biotin a Protein?
No. Biotin — also called vitamin B7 — is a water-soluble vitamin, not a protein. Your body uses it as a helper in several metabolic processes, including the ones that build keratin. The confusion is understandable, since biotin and keratin are discussed together so often, but they belong to different categories of nutrient entirely: one is a vitamin your body takes in, the other is a protein your body makes. According to the National Institutes of Health, biotin is involved in turning food into energy and in the metabolism of fats, carbohydrates, and proteins — including the keratin in hair, skin, and nails.
What Is Keratin?
Keratin is a fibrous structural protein — not water-soluble — that makes up the outer layer of hair, along with skin and nails. It's not unique to hair; it's the same family of protein that gives skin and nails their structure and resistance to damage. Your body produces keratin on its own inside the hair follicle, which is why a keratin shampoo can't "enter the follicle" and add more of it from the outside. What a keratin shampoo or conditioner actually does is deposit keratin onto the surface of the hair you already have, smoothing the cuticle and temporarily filling in rough or damaged spots.
Keratin vs. Biotin: What Each Actually Does for Hair
Biotin shampoo: works from the inside out, in theory — biotin supports your body's own keratin production. For people who already get enough biotin through diet (most people), extra biotin applied topically or taken as a supplement has limited evidence of making a measurable difference in growth or thickness, per the NIH. It's more accurate to think of a biotin shampoo as supporting a healthy scalp and hair environment than as a guaranteed growth treatment.
Keratin shampoo and conditioner: work from the outside in — they coat and smooth the hair shaft rather than changing what grows out of the follicle. That's genuinely useful for damaged, frizzy, or chemically processed hair, which has a rougher outer layer (cuticle) that keratin can temporarily smooth.
So when someone asks whether keratin or biotin is better for hair, the honest answer is that a keratin and biotin shampoo combination covers more ground than either used alone, because they're not solving the same problem.
Neither one is a substitute for the other, and neither is a cure for hair loss on its own. If you're dealing with thinning or shedding, that's worth bringing to a dermatologist rather than solving with shampoo alone.
Which Should You Use: Biotin Shampoo or Keratin Shampoo?
- Thinning hair, fine hair, or a concern about hair loss: start with a biotin shampoo — it's formulated to support the scalp and hair you're growing, not to repair existing damage.
- Frizzy, dry, damaged, or over-processed hair: a keratin conditioner is more directly useful, since it addresses the hair's surface rather than growth.
- Both: there's no conflict in using a biotin shampoo and a keratin conditioner together — many people do, since they address different parts of the problem. Our Biotin Shampoo and Conditioner Set pairs the two for that reason.
What's Actually in Our Biotin Shampoo and Keratin Conditioner
Here's the ingredient list we stand behind for both products — no filler ingredients we can't speak to.
Biotin Shampoo: biotin, Panax ginseng, jojoba, honeysuckle, licorice root, quinoa protein, and niacin (vitamin B3).
Biotin Keratin Conditioner: cetyl esters, biotin, keratin, and starch acetate.
Both are formulated without sulfates or parabens, and both are color-safe. We don't add rosemary, milk proteins, or argan oil to these formulas, whatever you may read elsewhere — if you see those listed for our products anywhere, that's an error, not our formula.
Keratin Shampoo Is Not the Same as a Keratin Treatment
One more source of confusion: a "keratin treatment" at a salon (sometimes called a Brazilian blowout or keratin smoothing treatment) is a different product category from keratin shampoo. Salon keratin treatments use heat to bond keratin to the hair and can involve formaldehyde-releasing chemicals — the FDA proposed a ban on those chemicals in 2023, but as of early 2026 that rule still hasn't been finalized, and the agency has missed its own deadline to issue it more than once. Keratin shampoo and conditioner, by contrast, are leave-on-then-rinse products with no heat-bonding step and no formaldehyde. If you're deciding whether a salon keratin treatment is right for you, that's a separate question from choosing a keratin shampoo — see our breakdown: Is Keratin Straightening Bad for Your Hair?
A Simple Routine for Using Both
- Shampoo with Biotin Shampoo to cleanse the scalp and support the hair you're growing.
- Follow with Biotin Keratin Conditioner on the mid-lengths and ends, where damage and dryness show up first.
- If you're also dealing with thinning, a Hair Restoration Spray can be used in addition to, not instead of, your wash routine.
For more on how often to wash, see our guide: How Often Should I Use Biotin Shampoo?
A Note From Our Founder
"I can't count how many times a client has come in using a keratin treatment to try to fix thinning hair, or a biotin shampoo to try to fix frizz — and wondering why it isn't working. They're not interchangeable. If your hair is thin or shedding, you need something that supports what's coming out of the follicle. If it's damaged or frizzy, you need something that treats the strand you already have. Most people need a little of both, which is exactly why we sell them as a set instead of pushing one over the other."
Steve Haymes is the founder of Biotin Xtreme Hair Care and Cuts Inc., and a hair loss and hair care specialist with more than 40 years of salon experience, named Best of Atlanta by CBS News. Steve reviews our hair care and styling content for accuracy; questions about medical conditions should go to a dermatologist. Meet our founders.
Frequently Asked Questions
Is biotin a protein?
No — biotin is a B vitamin (B7). Keratin is the protein. They work together, but they aren't the same category of nutrient.
Is keratin or biotin better for hair?
Neither is "better" in general — they target different problems. Keratin is better for smoothing damaged or frizzy hair; biotin is more relevant if you're focused on supporting hair you're growing, especially if thinning is the concern.
Does keratin shampoo help hair growth?
Not directly. Keratin shampoo coats and smooths existing hair; it doesn't change what grows from the follicle. If growth is your main goal, a biotin-based product is the more relevant starting point, alongside talking to a dermatologist if thinning is significant.
Does biotin shampoo work?
It depends what you mean by "work." Biotin supports the body's keratin production, and a biotin shampoo can be part of a healthy scalp routine, but the evidence that topical or supplemental biotin meaningfully increases hair growth in people who aren't deficient is limited, per the NIH. It's reasonable to use as part of a routine; it's not a guaranteed fix.
Can I use biotin shampoo and keratin conditioner together?
Yes — they're not redundant. Biotin shampoo cleanses and supports the scalp; keratin conditioner treats the strand. Using both covers more of the problem than either alone.
What are the benefits of keratin shampoo?
Smoother cuticles, less frizz, and more manageable detangling, especially on damaged or chemically processed hair. It's a surface-level, temporary effect rather than a structural change to the hair you're growing.
What are the benefits of biotin shampoo?
A biotin shampoo supports the scalp environment and your body's own keratin production rather than delivering a dramatic, visible effect on its own. People generally pair it with other habits — enough protein and nutrients in the diet, less tension on the hairline, consistent use over time — rather than expecting it to work in isolation.
What's the difference between keratin and biotin, in one sentence?
Keratin is the protein your hair is made of; biotin is a vitamin that helps your body make it — one is already in your hair, the other supports the process that builds it.
