Maybe it started with more hair in the shower drain, or a part that looks wider in photos than it used to. You keep checking the mirror and wondering whether this is normal, temporary, or something to act on.
Thinning hair has many possible causes, and the right next step depends on which one may apply to you. That question belongs with a clinician who can examine your scalp and ask about your health history.
The short honest answer: no single product reliably regrows thinning hair for everyone. The best-designed supplement studies ran for six months against placebo, and they measured hair counts, not a guaranteed look. This guide sorts out what was measured, what each option can and cannot promise, and what to do next.
| Who the studies included | Adults who described their own hair as thinning, in trials of 30 to 70 people |
| Longest placebo-controlled supplement trials | Two six-month trials in women (2018 and 2021) using Nutrafol-named capsules |
| Newest supplement trial | Saw palmetto extract, 60 adults, preliminary 90-day results only |
| Procedure trial | Exosome complex after microneedling, 30 adults, assessed at day 120; the abstract does not describe a placebo group |
| Side effects in the abstracts | No adverse events reported in the 2018, 2025 saw palmetto and exosome abstracts; the 2021 study describes the supplement as well-tolerated |
| Prices | Not listed on this page; check the seller’s checkout for current price and refund terms |
| Your first step | Track your hair with dated photos, then see a clinician about the cause |
Where are you starting?
Step 1: Work out what kind of thinning you are seeing
You are at the stage where you notice a change and want a name for it.
The studies measured hair counts and shedding as separate outcomes. The studies below measured adults who described their own hair as thinning, which is where many readers start.
How long shedding lasts is not answered by the studies in this guide. A simple record helps: dates, photos from the same spot and light, and a rough count of hair you find. Bring that record to your clinician, who can compare it with your history.
What this means for you: Start a dated log and photos for a few weeks before you buy anything. You and a clinician will then have something concrete to compare.
Read next
Why Is My Hair Falling Out? 10 Common Causes of Hair Loss: a walk through the common reasons hair thins or sheds.
Once you have a record, the next question is usually whether something in your body is contributing.
Step 2: Get a clinician to look at the cause
Hair thinning can come from many sources, and a clinician is the person who can sort them out for you.
Our nutrient deficiency guide explains what blood tests can and cannot show.
Iron is a common example. Our iron and hair loss guide explains why a measured deficiency matters more than a marketing claim. Tell your clinician and the lab about every supplement you take, because some can affect certain tests.
What this means for you: Ask for the cause to be checked before you add a supplement to fix it. Bring your supplement list and your thinning log to the visit.
Read next
Biotin Before Bloodwork: Skin, Hair and Nail Checklist: what to tell the lab before a blood draw.
With a cause in view, you can look at the options that have been tested in people.
Step 3: Look at the procedure and prescription options with research
The studies in this guide do not include a trial of a prescription hair-growth medicine for the scalp. They do include one registered study of latanoprost and bimatoprost eyedrops, which are described on ClinicalTrials.gov as FDA-approved for glaucoma and used there to grow eyelashes in people with alopecia areata. A registration describes a study; it is not a result.
A 2025 trial in PubMed tested a scalp procedure combining microneedling with an exosome complex. The complex is made by BENEV, Inc., and the study had 30 adults, 15 men and 15 women, with a mean age of 50.2. Treatments were given on days 0, 30, 60 and 90, and assessed on day 120. Terminal and vellus hair counts rose, shedding fell, and the investigator rated improved hair growth at 83%. The abstract reports no adverse events and does not describe a placebo group.
Ask a clinician whether a prescription or procedure fits your cause. Do not start or stop any medicine on your own.
What this means for you: The procedure study is small, measured at 120 days, and was rated by the investigator. It is a reason to ask about the option, not proof it will work for you.
Read next
Microneedling Hair Results: Timeline, Side Effects and Sessions: how long results take and what sessions involve.
Procedures are one branch. Supplements are the branch most readers ask about, so let’s compare their studies directly.
Step 4: Compare the supplement studies side by side
Three supplement trials are central here. Each one measured hair counts, and each was small.
| Study | Product named | Who | Length | Measured | Reported result | Limit |
| 2018 randomized trial, women | Nutrafol Women’s Capsules | 40 women: 26 active, 14 placebo | 6 months | Terminal and vellus hair counts by phototrichogram | Significant increase versus placebo at days 90 and 180 | Small group; abstract reports no adverse events |
| 2021 randomized trial, perimenopausal to postmenopausal women | Nutrafol Women’s Balance Capsules | 70 women: 40 active, 30 placebo | 6 months | Terminal, vellus and total hair counts; shedding | Significant versus placebo at days 90 and 180; shedding down 32.41% by day 180 in the active group | Only women in these menopausal groups; described as well-tolerated |
| 2025 randomized trial, men and women | Saw palmetto bioactive fatty acids extract (product not named) | 60 adults: 40 active, 20 placebo, half women | 6-month study; preliminary 90-day results | Terminal, vellus and total hair counts; shedding | Significant change from baseline and versus placebo in preliminary data | Preliminary; only 90-day results are presented |
The 2018 and 2021 studies name the Nutrafol products in their abstracts. The saw palmetto trial does not name its product, so you cannot match it to a product on a shelf without the label. Prices are not listed on this page; check the seller’s checkout for current price and refund terms.
To understand how studies like these are read, see this plain-language guide to how to read a clinical study.
What this means for you: The longest placebo-controlled trials ran six months. Match your expectations to that timeline, and check that the product you are considering is the one named in the study.
Read next
Hair and Nail Supplement Claims: Three Different Outcomes: why a supplement claim may cover more than one situation.
Sprays and shampoos are a separate category, and the research for them is different.
Step 5: Check sprays, shampoos and topicals before you buy
Hair sprays, serums and shampoos are sold on the promise that they will make hair look fuller or grow it. If a seller says a spray regrows hair, that is the seller’s statement. Check whether it names a study, who was in the study, how long it ran, and what it measured.
Our guide on whether sprays and topicals regrow hair sets out what the research does and does not show. Read our guide to ingredient evidence versus marketing claims for a checklist you can use on any label.
If you are ready to look at specific products, these site guides describe what each one claims and what to check:
For shampoos, our guide says the best one is the one that suits your scalp and helps your existing hair look clean and fuller. It is not a single top product for everyone.
What this means for you: A spray or shampoo can fit a routine, but no study in this guide shows a topical product regrowing hair for everyone. Read the claim and its study before you pay.
Read next
Best Hair Growth Products for Thinning Hair in 2026: a side-by-side look at sprays, serums and more.
Whatever you choose, safety comes before the next purchase.
Step 6: Stay safe while you try things
Using several products can raise questions about interactions and contraindications. Keep your list short and check it before adding anything.
- Before combining supplements, ask your healthcare team about possible interactions and contraindications.
- Do not assume that a natural ingredient is a safe one.
- Tell your clinician about every product you use.
A 2023 narrative review in PubMed reports 79,071 adverse events linked to dietary supplements reported to the FDA between 2004 and 2021, and argues that consumers need guidance from a healthcare team. A 2017 systematic review in PubMed of 26 supplement studies found that more than 30% showed some ECG changes. Tell your clinician what you take so they can weigh it.
What this means for you: Keep one list of everything you take, including sprays, shampoos and supplements, and bring it to every visit.
Read next
Multiple Skin Supplements at Once: Spotting Ingredient Overlap: how to find doubled ingredients on labels.
Once you have a list, your next steps are simple.
Your next step
- Start a dated log of your hair and take photos from the same spot and light.
- Book a clinician visit about the cause and bring your supplement list.
- Ask whether blood tests are needed.
- Compare only the products named in studies, and check the label and the checkout price and refund terms.
- If a product causes a problem, use our reporting guide and tell your clinician.
Every guide on this topic
Start with the cause
- Why Is My Hair Falling Out? 10 Common Causes: the common reasons hair thins or sheds.
- Hair Thinning and Nutrient Deficiencies: what blood tests reveal and what research supports.
- Iron and Hair Loss Claims: why testing and cause matter.
- Biotin Before Bloodwork: a checklist before a blood draw.
- Skin Supplements Before Surgery: what to tell your team before a procedure.
Procedures and prescription-related options
- Microneedling Hair Results: timeline, side effects and sessions.
Supplements and their studies
- Hair and Nail Supplement Claims: three different outcomes.
- Hair and Nail Supplements: Evidence Review: what the studies cover.
- Biotin and Skin Claims: deficiency evidence versus routine use.
- Zinc for Skin and Hair: Supplementation Evidence and Safety: what studies cover and the safety questions.
- Zinc: Upper Limits and Copper Questions: when to ask about limits.
- Zinc for Skin Deficiency Questions: deficiency questions versus general claims.
- Selenium in Hair and Nail Supplements: when more can backfire.
- Preformed Vitamin A and Pregnancy: reading beauty supplement labels.
- Vitamin C Skin Studies: Oral Intake Versus Topical Use: what each route studied.
- Vitamin C Skin Claims: Biology, Deficiency and Trials: what the claims rest on.
- Is Collagen Good for Men?: benefits, safety and timing.
- Astaxanthin Skin Claims: lab findings versus human outcomes.
- Probiotic Skin Claims: strain, dose and outcome.
- Skin Aging Claims: appearance measures versus disease claims.
- Skin Supplement Trial Duration: why timing changes the claim.
Sprays, shampoos and topicals
- Hair Growth Sprays and Topicals: do they regrow hair?
- Best Hair Growth Products for Thinning Hair in 2026: sprays, serums and more.
- Best Shampoo for Thinning Hair: ingredients and evidence.
- Akemi Hair Glow Hair Growth Spray Review: a product guide.
- HaloGrow Hair Spray Review: a product guide.
- Ilumnat Review: a product guide.
Labels, overlap and safety
- Multiple Skin Supplements at Once: spotting ingredient overlap.
- Beauty Blend Labels: ingredient amounts and hidden overlap.
- Skin Supplement Serving Math: double counting beauty products.
- Skin Supplement Allergens: label check questions.
- Report a Suspected Skin Supplement Problem: how to report a problem.
Other skin guides
- Qinux Lumiari Red Light Mask Review: a device product guide.
SkinCareSupplements.com may earn a commission on some purchases made through links on this page. Prices are not listed here; check the seller’s checkout for current price and refund terms.
By SkinCareSupplements.com Research & Editorial Team
This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.