Start losing hair and within weeks someone will have offered you everything: "hair mesotherapy", "platelet-rich plasma", ampoules, lasers and, at the bottom of the list, a hair transplant. They are almost always presented as alternatives: one or the other.
They aren't. Mesotherapy and PRP try to improve the hair you still have; a transplant puts hair where there is none left. Mixing them up is the most common reason people spend a year on sessions hoping for regrowth in an area that is already bald, or have surgery with no plan for the hair they are still losing.
This guide explains what each one is, what the evidence says without overselling it, and when each option makes sense. It isn't a prescription; it's what we would explain in a consultation.
Quick answer
- Medical therapy is the foundation (finasteride or dutasteride, plus minoxidil). It has the most and best evidence for slowing androgenetic alopecia.
- PRP (platelet-rich plasma) has modest evidence: in meta-analyses it raises density somewhat versus placebo, but the studies are small, very different from one another and low quality. It works as an add-on and maintenance, not a substitute.
- Hair mesotherapy is one name covering very different cocktails injected into the scalp. The evidence is weak and heterogeneous, and there are published cases of patchy hair loss after the injections.
- A hair transplant is the only one of the three that restores density to an area that is already bald, because it moves resistant follicles from the back of the head. It does not stop the loss of the hair you still have.
- The three don't compete: for many patients the right plan is medical therapy + (sometimes) PRP for the native hair + a transplant for the areas already lost.
First, the problem: what androgenetic alopecia is
Common baldness — receding temples, the crown, hair that keeps getting finer — happens because some follicles are sensitive to dihydrotestosterone (DHT). Over the years that hormone shrinks them: the hair grows thinner and shorter until the follicle stops producing it. That's what the Norwood scale measures.
This shapes everything else. A miniaturized but living follicle can potentially be rescued; a follicle that is gone cannot. No serum, ampoule or injection grows new follicles where there are none. For those areas, the only way to have hair again is to bring it from somewhere else.
The comparison in one table
| Medical therapy (finasteride / dutasteride, minoxidil) | Scalp PRP | Hair mesotherapy | Hair transplant | |
|---|---|---|---|---|
| What it is | Pills or a solution that lower DHT or stimulate the follicle | Your own blood, centrifuged, injected into the scalp | Injected cocktails (vitamins, peptides, minoxidil, dutasteride or others) | Surgery that moves follicles from the back of the head to bald areas |
| What it aims to do | Slow loss and recover weakened hair | Improve density and thickness of existing hair | The same, depending on the cocktail | Restore density in already-bald areas |
| Quality of evidence | The best: large trials and years of follow-up | Moderate to low: small, heterogeneous studies | Weak: few trials, highly variable protocols | Solid for its purpose: transplanted hair keeps its resistance |
| Grows hair in already-bald areas | No | No | No | Yes |
| Slows progression | Yes, while you use it | Possibly, modestly | Not demonstrated | No |
| How long it lasts | As long as you take it | Needs maintenance sessions | Needs repeated sessions | Transplanted hair is permanent |
| Main risks | Those of the drug (see the finasteride guide) | Pain and discomfort at the injection site | Pain, dermatitis and reported cases of patchy hair loss | Those of minor surgery under local anesthesia |
Hair mesotherapy: what it is and what we know
Mesotherapy means many shallow micro-injections into the scalp. The problem is that the word doesn't describe what is injected. The same name is used to sell mixes of vitamins, amino acids, peptides, growth factors, plant extracts, minoxidil or dutasteride, at concentrations and frequencies that change from one clinic to the next.
What the evidence says. The most recent systematic review of injectable therapy for androgenetic alopecia gathered 30 studies: only 7 were interventional; the rest were observational or descriptive. The most-studied agents were vitamin and peptide formulations, followed by dutasteride. The authors concluded there may be a cosmetic benefit — particularly with dutasteride — but that the evidence is limited by small samples, variable protocols and short follow-up, and that randomized trials are needed before it can be recommended as routine therapy (Beer et al., 2026).
What almost nobody mentions: patchy hair loss. The same review lists paradoxical alopecia — losing hair exactly where it was injected — among the adverse events. It isn't new:
- In 2009, two patients were described with patchy alopecia after mesotherapy with a vasodilator and with homeopathic agents; one was left with a small area of scarring (Duque-Estrada et al., 2009).
- In a series of 15 patients treated with dutasteride mesotherapy, four developed bald patches at the injection site after a single session; the authors point to preservatives and solvents in the cocktail as possible culprits (Chandrashekhar et al., 2025).
- In three women with androgenetic alopecia, dutasteride mesotherapy left patches that never fully recovered; one needed surgical correction (Nogueira and Osório, 2026).
These are case series, not studies that measure how often it happens. But they say something important: injecting is not harmless, and product quality and technique matter. To avoid confusion: these cases involve dutasteride injected into the scalp, not the dutasteride capsule taken by mouth.
Our reading. If someone offers you mesotherapy, ask exactly what it contains, at what concentration, who manufactures it and who will inject it. If the answer is "a vitamin cocktail", it's reasonable to expect little. And it should never be the only thing you do if your hair loss is active.
Scalp PRP: the best-studied of the injectables
PRP (platelet-rich plasma) comes from your own blood: a tube is drawn, centrifuged to concentrate the platelets, and that plasma is injected where the hair is thinning. The idea is that platelet growth factors stimulate follicles that are still alive.
What the evidence says:
- A meta-analysis of 9 randomized trials (238 patients) found that PRP increased hair density at 3 and 6 months versus placebo, but the gains in hair count and diameter were not different from placebo. No serious adverse events were reported (Zhang et al., 2023).
- Another meta-analysis, of 13 trials, also found more density with PRP, but the authors themselves rate the evidence as low quality: the studies were very heterogeneous, with evident publication bias (Kieling et al., 2024).
- Added to topical minoxidil, PRP gave better density results than minoxidil alone across five trials, with "low to very low" certainty of evidence (Yao et al., 2024).
In plain terms: PRP probably helps a bit, mainly as an add-on to medical therapy and in hair that is thinning, not on smooth scalp. There is no standard protocol — every clinic prepares the plasma differently — and, like any treatment that stimulates existing hair, its effect needs maintenance: stop it and the hair loss carries on.
Who it may suit: people with diffuse or early-stage loss who are already on medical therapy and want to add something; people who can't or won't take oral medication (for example many women of childbearing age, for whom finasteride is not an option), always with realistic expectations.
Who it won't help: anyone expecting regrowth on a temple or crown that is already smooth. PRP has nothing to work on there.
Medical therapy: the foundation for everything else
Before talking about injections or surgery, talk about what has the most evidence. A network meta-analysis of 23 studies in men compared minoxidil, finasteride and dutasteride: dutasteride 0.5 mg a day gave the largest increase in total hair count at 24 weeks, and finasteride 1 mg and oral minoxidil also showed measurable effects depending on the outcome and time point (Gupta et al., 2022).
These drugs have side effects worth understanding before you start; we cover them with studies in our guide to finasteride side effects, which also covers dutasteride, the option we usually prefer at Colombia Care after an assessment. None of them should be taken without a prescription and medical follow-up: which drug, what dose and whether it suits you is your doctor's call.
A hair transplant: the only thing that puts hair back on a bald area
A transplant doesn't stimulate anything: it relocates. Follicular units are taken from the back and sides of the head — areas whose hair is resistant to DHT — and placed one by one where they are missing. Those follicles keep their resistance in their new location, which is why transplanted hair usually lasts a lifetime.
It's the only option in this guide that can rebuild a hairline or cover a crown that is already bald. But it has two limits that need saying clearly:
- The donor area is finite. You can't cover any area at any density; the plan is designed around how you'll look at 60, not just next year.
- It doesn't protect native hair. The hair of your own that remains around the transplanted zone is still exposed to DHT. If it keeps falling out, over the years you can end up with a transplanted strip and a gap behind it. That's why, in young men or with active loss, we usually recommend stabilizing with medical therapy first.
For our hair transplant in Medellín the standard rate is $4,900 COP per graft (about US$1.40), with everything it includes published on our hair transplant cost in Colombia page. As a reference, a 2,000-graft case comes to $9,800,000 COP (about US$2,800). We don't quote PRP or mesotherapy prices here: they vary widely with the number of sessions and the product, so always compare the cost of a full year of sessions — and of five — against what each option can realistically achieve.
Which one fits your case
| Your situation | What usually makes sense |
|---|---|
| You're starting to notice finer hair, no bald areas | Medical assessment and medical therapy; PRP can be added as a complement |
| Active loss and receding temples, under 30 | Stabilize with medical therapy first; plan a transplant only once the pattern is predictable |
| Temples or crown already smooth | A transplant for those areas + medical therapy to protect the rest |
| Woman with diffuse thinning | Investigate the cause first (hormones, thyroid, iron); minoxidil and PRP are common options; a transplant only in selected cases |
| You don't want to take medication | There are alternatives (topical minoxidil, PRP) with more modest expectations; a transplant is still possible with a more conservative plan |
| You're offered a 10-session mesotherapy "package" as the solution | Ask what's in it, what evidence it has and what happens to your hair when the sessions end |
Questions worth asking before you pay for any treatment
- What exactly am I trying to achieve? Slow the loss, thicken what I have, or recover a bald area? Each goal has a different tool.
- What's in the syringe? For mesotherapy, the product name, concentration and manufacturer. For PRP, how it's prepared.
- How many sessions, and for how long? And what happens if you stop.
- How will the result be measured? Standardized photos in the same light, or trichoscopy, before and after. Without measurement there's no way to know if it worked.
- Who is recommending it? A physician who has looked at your type of hair loss, not someone selling packages.
Summary
Mesotherapy, PRP and a hair transplant are not three versions of the same thing. Medical therapy is the foundation and the best way to slow androgenetic alopecia. PRP has modest evidence and works as an add-on that needs maintenance. Mesotherapy has the weakest evidence of the three and risks that aren't always disclosed. And a transplant is the only thing that puts hair back where there is none, but it doesn't replace looking after the hair you still have.
If you'd like a physician to review what stage you're at and which combination makes sense for you — even if the answer is that you don't need surgery yet — book a free assessment.
Message us on WhatsApp and a physician will reply →
This article is for information only and does not replace a medical consultation. Don't start, change or stop any treatment without talking to your doctor.
Sources
- Beer J, et al. Injectable therapy for androgenetic alopecia: a systematic review. Dermatol Surg. 2026. PMID 41603616
- Duque-Estrada B, et al. Alopecia secondary to mesotherapy. J Am Acad Dermatol. 2009. PMID 19577328
- Chandrashekhar M, et al. Paradoxical nonscarring alopecia following mesotherapy with dutasteride: a case series. Int J Trichology. 2025. PMID 41346555
- Nogueira CM, Osório F. Persistent alopecic patches following dutasteride mesotherapy for female androgenetic alopecia: a case series. J Drugs Dermatol. 2026. PMID 41779759
- Zhang X, et al. Platelet-rich plasma for androgenetic alopecia: a systematic review and meta-analysis of randomized controlled trials. J Cutan Med Surg. 2023. PMID 37533146
- Kieling L, et al. Is autologous platelet-rich plasma capable of increasing hair density in patients with androgenic alopecia? A systematic review and meta-analysis of randomized clinical trials. An Bras Dermatol. 2024. PMID 39013743
- Yao J, et al. The additive value of platelet-rich plasma to topical minoxidil in the treatment of androgenetic alopecia: a systematic review and meta-analysis. PLoS One. 2024. PMID 39197003
- Gupta AK, et al. Relative efficacy of minoxidil and the 5-α reductase inhibitors in androgenetic alopecia treatment of male patients: a network meta-analysis. JAMA Dermatol. 2022. PMID 35107565