Vegamour GRO Hair Serum is a well-made, drug-free scalp serum with thin evidence and a high price. It is pleasant to use and may help shedding a little, but the brand's headline numbers come from a 40-person survey, not a controlled trial.
If you want the best-proven option for thinning hair, it is not this. If you want a vegan, minoxidil-free routine and can afford four months to find out, it is a reasonable thing to try. Here is why.
a glass dropper bottle of scalp serum beside a comb on a white bathroom shelf, soft daylight
This review is independent and unpaid. Prices, directions, ingredients and the brand's study figures were checked on Vegamour's own product pages in October 2026, and we link to the brand directly.
From the editor
Vegamour is the bottle clients try before they are ready to talk about minoxidil. That is a fair instinct, and a serum like this can sit alongside a proper plan.
What it should not do is replace one. If the part has widened over the past year, a doctor's visit matters more than which serum you pick.
MH
— Megan Holloway, Editor-in-Chief
The short verdict
Try it if your shedding is mild, you want a drug-free option, and the price does not sting. It is light, non-greasy and easy to fit into a routine.
Skip it if your thinning is progressing, you want the strongest evidence for your money, or your scalp reacts to alcohol or essential oils. Topical minoxidil has decades of trials behind it; GRO has a brand survey.
What Vegamour GRO Hair Serum is
GRO Hair Serum is a leave-in scalp serum sold in one- and three-month supplies. You apply one dropperful to the scalp daily, on wet or dry hair, massage it in and do not rinse.
It contains no minoxidil or any other drug ingredient, and it is sold as a cosmetic. Vegamour badges it vegan and cruelty-free. There is also a newer, pricier GRO+ Advanced Hair Serum with a different formula, covered below.
What’s in the formula
The ingredient list on Vegamour's page is short, and the actives are clear.
Red clover and mung bean sprout extract. Red clover contains biochanin A, a plant compound that blocked 5-alpha-reductase in lab tests. That is the enzyme behind hormone-driven thinning, which is why it shows up in hair serums.
Turmeric callus conditioned media. A plant-cell extract. There are lab and animal studies on curcumin and hair, but we found no human trial for hair loss.
Caffeine and biotin. Caffeine has some lab support for hair follicles. Biotin on the scalp does nothing for growth; it only matters if you are deficient, and then it has to be eaten.
Peptides, bergamot oil and alcohol. Three plant-made peptides, bergamot oil (with limonene and linalool), and denatured alcohol fourth on the list. The alcohol helps it dry fast, but it can sting or dry a sensitive scalp.
Does Vegamour GRO work? What the evidence says
Vegamour reports that in a 120-day study of 40 people using the serum once a day, 93% saw less shedding, 90% saw improved appearance and 83% said their hair felt stronger. Those are self-reported impressions. The brand page describes no placebo group, no randomisation and no hair counts.
The best outside evidence for the hero ingredient is a small 2013 trial in the Journal of Cosmetic Science. Thirty people with mild to moderate hair loss used either a placebo or a lotion of red clover extract plus acetyl tetrapeptide-3 for four months, and the active group did better. But it tested a combination, and the original GRO serum does not contain acetyl tetrapeptide-3.
So the honest summary is that GRO rests on plausible ingredients and favourable user impressions, not on proof. For a side-by-side of what has stronger trials, see thinning hair treatments by cause.
GRO vs GRO+ Advanced Hair Serum
GRO+ Advanced is the newer formula. It adds biotinoyl tripeptide-1, acetyl tetrapeptide-3, caffeine, turmeric root, rhubarb root and chlorella in liposomes, and Vegamour suggests pairing it with its dermaroller.
Its brand study has the same design as the original: 40 people, 120 days, self-reported (98% saw less shedding). Because it contains acetyl tetrapeptide-3, it is closer to the combination tested in 2013. It also costs more, so it is the one to choose only if you have decided to commit to the line.
GRO Hair Serum
GRO+ Advanced Hair Serum
One month, one-time
$64
$78
Three months, one-time
$165
$198
One month, subscription
$49
$65
Acetyl tetrapeptide-3
No
Yes
Brand study
40 people, 120 days, self-reported
40 people, 120 days, self-reported
Vegamour prices, October 2026.
How long Vegamour GRO takes to work
Vegamour's FAQ says many people see results within three to four months of daily use. That matches the hair cycle: anything that affects shedding takes a full season to show.
Take a photo of your part in the same light before you start, and again at 16 weeks. If nothing has changed by then, the serum is not working for you, and four months of one-time prices is roughly $250.
Is it good for fine hair?
For fine hair, the format is a strong point. It is a light, fast-drying liquid that goes on the scalp, not the lengths, so it does not flatten the roots the way an oil would.
Apply it at night or to damp hair before styling, part by part, rather than pouring it across the crown. If your roots look greasy, you are using more than one dropperful.
The rest of the GRO line
Vegamour sells the serum alongside GRO Revitalizing Shampoo and Conditioner ($48 each for 8 oz), GRO Dry Shampoo ($36), GRO Biotin Gummies ($36) and a silicone scalp massager. None of these is needed for the serum to work.
The most likely problem is scalp irritation from the alcohol or the bergamot oil and its fragrance allergens. Patch-test behind the ear for two days before using it on your whole scalp.
Pregnant or breastfeeding readers should ask their doctor first, as with any active scalp product. And if you have patchy loss, a painful or scaly scalp, or sudden shedding, see a doctor rather than a serum; why is my hair thinning? explains the causes worth ruling out.
It may help some people shed less, but the evidence is weak. Vegamour’s figures come from a 40-person, self-reported study with no placebo group. Its red clover extract has one small controlled trial behind it, but that trial combined it with a peptide the original serum does not contain.
No. Neither GRO Hair Serum nor GRO+ Advanced contains minoxidil or any other drug ingredient. It is sold as a cosmetic, built around red clover, mung bean, turmeric, caffeine, biotin and peptides.
Vegamour says many people see results within three to four months of daily use. Photograph your part before you start and again at about 16 weeks; if nothing has changed, it is not working for you.
At Vegamour’s own prices in October 2026, a one-month supply is $64, or $49 on subscription, and a three-month supply is $165. GRO+ Advanced costs $78 for one month.
GRO+ Advanced is a newer, pricier formula that adds acetyl tetrapeptide-3, biotinoyl tripeptide-1 and other extracts in liposomes. Both brand studies used 40 people over 120 days and self-reported results.
The format suits fine hair: a light, fast-drying liquid applied to the scalp, not the lengths, so it does not weigh the roots down. Use one dropperful and avoid pouring it over the crown.
Irritation is the more likely problem, from the denatured alcohol and bergamot oil. Patch-test first. We found no reliable source documenting an initial shedding phase from this serum.
Prices, ingredients and study figures were checked on Vegamour’s official site in October 2026; formulas and prices change, so check the label before you buy. This review is independent; Vegamour did not see it or pay for it. It is general information, not medical advice.
Images in this article are AI-generated illustrations, not photos of real clients or results. See our image policy.
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