Active ingredients: what actually works

Hair growth marketing loves mystery — proprietary complexes, unpronounceable promises. We prefer the opposite. Here's what's actually in serious hair growth formulas, what each ingredient does, and what to realistically expect.

The stimulation tier

• Redensyl. A plant-derived complex targeting follicle stem cells, designed to push follicles from the resting phase into active growth. One of the best-performing non-drug actives in manufacturer and independent testing.
• Capixyl. A peptide (Acetyl Tetrapeptide-3) combined with red clover extract — supports follicle anchoring and counters DHT activity locally. The peptide angle matters: it works on the structure around the follicle, not just the follicle itself.
• Procapil. A combination of biotinyl tripeptide, apigenin, and oleanolic acid. Improves microcirculation around the follicle and helps slow the miniaturisation that makes hair thinner each cycle.
• Caffeine. The workhorse. Cheap, well-studied, stimulates the follicle and counteracts DHT's suppressive effect on growth. Not a miracle alone — a good team player.

The DHT tier

• Saw palmetto (Serenoa). The best-known plant-based DHT modulator. Works on the same enzyme pathway as pharmaceutical blockers, more gently — which is exactly why it belongs in a topical routine.
• Pumpkin seed oil. Backed by one of the more cited supplement studies in the field. Supports the same anti-DHT mechanism and nourishes the scalp along the way.

The environment tier

• Rosemary oil. The famous one — a comparative study found it held its own against 2% minoxidil over six months, with less scalp irritation. Supports circulation and follicle health.
• Green tea extract. Antioxidant support for the scalp; EGCG has shown follicle-protective properties in lab research.
• Menthol and adenosine. Circulation and growth-signal support, plus the practical benefit that you feel the product working — which keeps routines alive.

How to read any formula

1. Look for combinations, not heroes. Hair loss has several mechanisms; a formula should cover more than one. A single-active serum is a partial answer.
2. Check the INCI list. If a brand hides its full ingredient list, that's your answer. The actives above have real INCI names — you can verify every one.
3. Expect weeks, not days. Any active that promises visible results in a fortnight is marketing. Biology takes about 14 weeks to show its hand.

This is exactly how the Plenty serum is built: Redensyl, Capixyl, Procapil, Serenoa, and caffeine in one formula, with the full INCI printed where you can read it.