I’m sure many of you have been searching for the best hair growth supplement, and you’ve probably tried many (maybe even too many!). Gummies, powders, those “TikTok” gimmicks, and a celebrity-endorsed bottle. But 6 months later, your hair still looks the same (ugh!).
Well, the thing you need to understand about your hair is that multiple factors are at play. These factors are: your protein intake, nutrient intake, hormonal balance, and time. There isn’t a single magic pill that meets all these requirements, which is why I don’t love using single-ingredient supplements without a specific reason.
In this post, I’ll review which supplements are worth spending your money on, why biotin is often oversold, and how to build a sensible stack that’s matched to what really matters to your hair.
Table of Contents
- Why There’s No Single “Best” Hair Growth Supplement
- The Supplement Stack That Has Evidence
- Does Biotin Actually Work for Hair Growth?
- Why Collagen Peptides Are a Smart Foundation
- Why Women Often Notice Hair Changes
- How to Choose a Quality Hair Supplement
- How Long Does It Take to See Results?
- When to See a Doctor Instead
Why There’s No Single “Best” Hair Growth Supplement
Hair growth is influenced by a combination of factors, not a single “best” way. The best approach is finding a solution that tackles what’s contributing to your hair changes.
Factors That Drive Hair Growth
Think of your body as a machine that operates off of inputs. The four inputs that guide this system are:
- Protein: It’s the raw material that goes into the system.
- Iron, Vitamin D, Zinc, and B Vitamins: These nutrients keep that production line moving.
- Hormones: Hormones (and their balance) set the pace.
- Time: Like all great things in life, hair takes time to grow.
Choosing a Single-Ingredient Supplement vs. a Stack
When one of these inputs runs low, your hair can feel it. A single-ingredient solution typically meets the need for that specific nutrient. So if your nutrient gap or shortfall is due to another reason, you may not get results from supplementing that specific ingredient.
That’s the advantage of creating a stack to your individualized needs rather than selecting a product with the boldest claims on the shelf.
The Supplement Stack That Has Evidence
Of the options I’ll review, collagen peptides have the most evidence behind them, mostly for skin benefits, but studies on hair benefits are emerging. Aside from collagen, some other ingredients to consider are iron/vitamin D (If you’re low in levels), zinc, B vitamins, and protein.
Here’s the TL;DR on them and why they’re important to include in a stack:
| Ingredient | Why | Who It’s Most Helpful For |
|---|---|---|
| Collagen peptides | Supplies glycine, proline, and hydroxyproline. These are amino acids your body uses to build keratin. | For anyone looking for support with skin, with some emerging research for hair. |
| Iron | Low ferritin (your iron stores) is a common nutrient gap for women with hair changes. | Women with hair loss who also have low ferritin levels. |
| Vitamin D | Plays a role in the hair growth cycle. | For anyone whose levels test low. |
| Zinc | Plays a role in tissue repair and follicle function. | For anyone whose levels test low. |
| B vitamins, including biotin | These are cofactors your body uses in keratin production. | For anyone looking for support with hair as part of a complex, not a single biotin “mega dose”. |
| Protein | Hair is mostly made of protein. | For anyone looking for support with hair. |
Reviews of the role of vitamins and minerals in hair loss support this overall approach, tying low iron, zinc, vitamin D, and B vitamins to hair changes.*
This isn’t an exhaustive review, of course. For a deeper vitamin-by-vitamin breakdown, you’ll want to read up on the best vitamins for healthy hair.
Does Biotin Actually Work for Hair Growth?
Biotin could work for hair growth if you’re deficient. You don’t need to do a “mega dose” of biotin to get results.
When Biotin Actually Helps
Biotin could support hair growth only if you have a deficiency. It’s supported by studies like this one. However, true biotin deficiency is rare in healthy adults, especially in the United States.
For most people, taking large doses of biotin alone is unlikely to produce change.
Why Most Biotin Supplements Disappoint
The study I mentioned above involves people who had a deficiency to begin with. Deficiencies could be related to diet or medical/genetic causes.
Further studies are needed on biotin to determine whether it actually works in healthy individuals who aren’t deficient.
The Biotin Dose That’s Reasonable (vs. Overkill)
If you eat a balanced diet, you’re probably getting enough biotin. However, if you do decide to supplement, a 5,000-10,000 mcg dose is more than plenty to satisfy what biotin is actually good for.
There are many supplements that have 50,000 mcg (and promise the world!), but that’s likely overkill. Plus, taking too much biotin could skew your bloodwork.
Why Collagen Peptides Are a Smart Foundation
Collagen peptides provide amino acids that go into keratin: the structural protein in hair. Research is still emerging, but collagen could pair well with adequate protein intake for a stronger hair, skin, and nails system.
What Collagen Does For Hair Structurally
Your hair shaft is made mostly from keratin. And keratin is built from amino acids.
But first, let’s review what collagen peptides are. Collagen peptides are rich in glycine and proline, which your body relies on for connective tissue building and repair. Hydrolyzed peptides are broken down for you, making them easier to absorb.
What The Research Currently Shows
Most research on collagen seems to focus on skin rather than hair, but similar principles could apply. For example, this meta-analysis of 26 trials showed consistent skin and connective tissue benefits. After all, hair shares the same foundation as skin.
Why Polyphenol Blends Like Dermaval Can Complement Collagen
I’m personally a big fan of Collagen with Dermaval. It’s an example of a thoughtful supplement and true stack built around support for hair, skin, and nails.
It contains hydrolyzed collagen peptides AND the Dermaval polyphenol complex, which is studied for the broader hair-skin-nails system rather than just a single outcome. It’s the extra “oomph” that I treat myself to (and recommend to my clients!) to feel and look beautiful from the inside out.
Why Women Often Notice Hair Changes
Women often notice hair changes because they can show up as a symptom of a bigger issue at hand. These reasons could include hormonal shifts, iron stores, thyroid changes, chronic stress, and severe dietary changes.
Postpartum and Perimenopause
Two of the big ones are related to hormones.
After birth, many women shed more than usual for a few months. That’s a normal transition as estrogen levels return to normal (and hair recovers on its own). Johns Hopkins Medicine notes that hair could start returning to normal growth after 6-12 months.
Perimenopause is the other reason. This life stage can shift the balance again, with some hair thinning to follow due to the effects of estrogen and androgen levels on the follicle growth cycle.
Low Iron and Ferritin
Low iron is definitely a big culprit. Before it becomes a clinical problem, low ferritin can show up as extra shedding.
Research suggests that iron may play a role in patterned hair changes in pre-menopausal women. So, if iron is a concern, you may want to do some blood tests with your doc. If your levels come back low, iron supplementation could potentially help close that nutrient gap.
Lifestyle Factors
Thyroid changes and long stretches of high stress can make you shed more. Or, on a fad diet or rapid calorie cut? Having fewer calories or protein can also be linked to hair loss. Hair loss often reflects other factors happening upstream.
How to Choose a Quality Hair Supplement
Look for a formula that contains collagen as the base, then consider adding a stack that contains a B-vitamin complex.
Quality Markers to Check on the Label
Run the label for a quick review to ensure it contains collagen peptides.
Also, look for third-party testing (e.g. Informed Sport or similar) so you know what’s on the label is what’s really in the tub.
When to Add More Supplements vs. Rely on a Single Formula
When a single formula doesn’t cover an individual gap, that’s when a stack or a targeted add-on could make sense.
Consider stacking additional ingredients as needed. The stack could include biotin (in a reasonable 5,000-10,000 mcg range) and a B-vitamin complex rather than just B7.
If you want to look beyond collagen, this skin vitamins overview is a useful next read for answering “what’s next”.
How Long Does It Take to See Results?
Hair grows about half an inch per month, so most supplement stacks take 8 to 12 weeks of steady and daily use before changes can be seen. So, if you’re looking for thickness or density improvements, it’s probably more like 16 to 24 weeks.
Since hair growth is pretty slow, consistency beats out intensity. Take your stack with the same dose on most days for 3 months and see how your hair looks. For the collagen timeline specifically, how long collagen takes to work on hair walks through this in more detail.
When to See a Doctor Instead
Sudden and severe shedding, patchy hair loss, scalp pain or itching, or any other changes accompanied by severe fatigue or weight changes might warrant a visit to the doctor.
Warning Signs That Need a Doctor
Here are some signals that may be pointing to a problem that a supplement can’t address:
- Clumps of hair coming out
- Distinct, bald patches
- A painful, itchy, or visibly irritated scalp
- Shedding alongside fatigue, weight change, or feeling “off” overall
What Blood Tests Can Reveal
Your healthcare provider can run a full panel, including ferritin, thyroid, and vitamin D levels, that might help pinpoint what’s going on.
And then there are conditions like alopecia, which need medical care. While supplements can support already healthy hair, a diagnosable condition is better left to you and your doc.
Best Hair Growth Supplement: Frequently Asked Questions
What is the best vitamin for hair growth?
No single vitamin works for everyone, but iron and vitamin D matter most. Low levels of either could show up as hair changes. After you check those, back them up with a B-vitamin complex and enough protein.
Does biotin really make your hair grow?
Biotin can help if you’re deficient. If you already get enough from food, it’s not likely to help.
Why is my hair thinning all of a sudden?
Sudden thinning could be due to a hormone shift (postpartum or perimenopause), low iron/ferritin levels, thyroid changes, stress, or a recent severe diet change. Blood tests could help you narrow it down.
Can low iron cause hair loss?
Yes, low iron, and especially low ferritin, is commonly associated with hair loss in women. Check with your provider on levels before you supplement.
Is it safe to take multiple hair supplements together?
For most healthy adults, a collagen, a B-vitamin complex, and a targeted iron or vitamin D supplement can be stacked just fine. Check the doses so you’re not doubling up on the same nutrient. Talk to your provider if you have any medical conditions.
Can hair supplements work for postpartum hair loss?
Postpartum shedding is typically a normal hormonal transition that should resolve on its own. Taking enough protein, collagen, and iron could support your hair in this journey, although they don’t speed up the hormonal reset itself.
Conclusion
So, what’s the best hair growth supplement out there? Hair responds to a sensible and steady approach more so than just any single supplement. Additionally, make sure you get enough protein, cover any nutrient gaps, and use a consistent, foundational stack for 8 to 12 weeks before evaluating.
For that foundation, Collagen with Dermaval pairs hydrolyzed peptides with the Dermaval polyphenol complex: easy daily support for hair, skin, and nails.
Or, if you want to check out all your options first, browse the 1st Phorm hair, skin, and nails supplements collection to choose what best fits your gaps. While I’m thankfully past my postpartum hair loss stage, I still like getting a glow up for my hair, skin, and nails with these solutions.
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*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
