PSO · Cucurbita pepo seed oil
Pumpkin seed oil (PSO) is pressed from the seeds of Cucurbita pepo and is rich in unsaturated fatty acids, phytosterols (notably beta-sitosterol and delta-7-sterols), tocopherols (vitamin E), and carotenoids. For hair, interest centers on its phytosterol content, which is thought to inhibit 5-alpha-reductase and exert mild anti-androgen activity - the same pathway targeted in androgenetic alopecia.
Starting dose. 400mg — Daily (trial dose)
Daily with food. Allow 3-6 months for any hair response. Single small trial - manage expectations.
Start here. Every protocol below is ordered lowest-first. Begin at the smallest effective dose, hold about a week to assess tolerance, and step up only if needed.
Pumpkin seed oil's proposed hair mechanisms are largely androgen-pathway and nutritional:
Beta-sitosterol and other delta-7 phytosterols in PSO are proposed to inhibit 5-alpha-reductase, reducing conversion of testosterone to DHT - the androgen that miniaturizes susceptible scalp follicles. This is the most-cited rationale, drawn largely from animal/anti-androgen data.
Animal studies show antiandrogenic effects of PSO components, supporting a plausible mechanism for slowing pattern hair loss.
Unsaturated fatty acids and vitamin E provide antioxidant and scalp-conditioning support; carotenoids and phytoestrogens may contribute minor secondary effects.
The key clinical trial used oral PSO (400 mg/day). Separate animal work has explored topical PSO. Mechanistic specificity for the human scalp follicle remains incompletely characterized.
Weeks 1-8: minimal subjective change.
Weeks 8-16: possible reduced shedding.
Months 3-6: modest hair-count changes if responsive.
Each reference below was re-fetched from its PubMed record, and the quoted sentence was confirmed to appear in that abstract and to support the claim it sits under. Follow any of them to read the source.
Pumpkin seed oil (PSO) has been shown to block the action of 5-alpha reductase and to have antiandrogenic effects on rats.
Pumpkin seed oil (PSO) has been shown to block the action of 5-alpha reductase and to have antiandrogenic effects on rats.
Evidence scope. Human male alopecia trial background; proposed mechanism is based on prior rat evidence.
Claims we could not support
No abstract we checked supports these for this molecule at this route. That is not the same as saying they are false — it marks where the evidence is missing.
Dose/route: 400mg daily (trial dose) via Oral softgel or oil, 1x daily. No checked live PubMed abstract supported this complete molecule/formulation/route/dose/frequency combination.
Primary safety claim: Mild GI upset at higher oil intakes. No checked live abstract directly established this as the primary concern for the card's exact formulation and regimen.
Not well characterized (mixed oil components)
Dietary fat absorption
Hours per dose; hair effects accrue over months
Fat-soluble actives absorbed with dietary fat
Daily dosing; hair outcomes assessed over 3-6 months
Hepatic (fatty acid and sterol metabolism)
Storage. Store cool and dark; refrigerate after opening to limit oxidation of unsaturated oils.
Dietary supplement / food oil (US, DSHEA). Not an FDA-approved drug for hair loss.
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