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Pumpkin Seed Oil (Cucurbita pepo)

Cucurbita pepo
Evidence Level
Moderate
2 Clinical Trials
5 Documented Benefits
3/5 Evidence Score

Pumpkin seed oil is cold-pressed oil from pumpkin seeds — particularly from STYRIAN pumpkin (Cucurbita pepo var. styriaca) without seed coats. Used in European phytotherapy for BPH, overactive bladder, and hair growth. Active compounds include phytosterols (delta-7-sterols, beta-sitosterol), unsaturated fatty acids (linoleic, oleic), and tocopherols. Distinct from pumpkin seed extract used in different contexts.

Studied Dose 1-3 g/day pumpkin seed oil (typically 1,000-3,000 mg in capsules); 320-360 mg standardized extract for hair (Cho 2014)
Active Compound Delta-7-sterols (delta-7-stigmasterol, delta-7-avenasterol), beta-sitosterol, linoleic acid, oleic acid, tocopherols, cucurbitin

Benefits

BPH Symptom Improvement

Multiple European trials show pumpkin seed oil/extract modestly improves BPH symptoms vs placebo. Friederich 2000 and others established evidence base. Effect smaller than alpha-blockers but reasonable adjunct in mild-moderate BPH.

Supported by Trial 2, Trial 1

Overactive Bladder (OAB) — Both Sexes

Nishimura 2014 trial showed pumpkin seed oil reduced urinary frequency and overactive bladder symptoms in adults with OAB. Important: useful for both men (often combined with BPH context) and women. Modest evidence.

Supported by Trial 2

Hair Growth (Androgenic Alopecia)

Cho 2014 RCT showed pumpkin seed oil (400 mg/day) increased hair count by 40% vs placebo (10%) in men with androgenic alopecia over 24 weeks. Mechanism: 5-alpha-reductase inhibition (modest). One of few evidence-based natural hair growth interventions.

Supported by Trial 1

Hormonal Modulation (5-Alpha-Reductase)

Pumpkin seed oil compounds modestly inhibit 5-alpha-reductase — same target as finasteride. Clinical effect smaller than prescription medications but contributes to hair and prostate effects.

Supported by Trial 1, Trial 2

Cardiovascular Modest Benefits

Rich in unsaturated fatty acids and tocopherols. Modest cholesterol effects. General cardiovascular nutrition.

Supported by Trial 2

Mechanism of action

1

5-Alpha-Reductase Inhibition

Pumpkin seed oil (especially delta-7-sterols and other plant sterols) modestly inhibits 5-alpha-reductase — reducing testosterone-to-DHT conversion. Mechanism for both BPH and hair growth applications. Less potent than finasteride.

2

Phytosterol Content

Beta-sitosterol and other phytosterols contribute to BPH mechanism (similar to standalone beta-sitosterol). Anti-inflammatory in prostatic tissue.

3

Cucurbitin Content

Cucurbitin (specific amino acid in pumpkin seeds) has anthelmintic (anti-parasite) properties — basis for traditional intestinal parasite use. Modern relevance limited; supplements typically for other indications.

4

Bladder Smooth Muscle Modulation

Some compounds may affect bladder smooth muscle, reducing overactive contractions in OAB context. Mechanism less well-characterized than for BPH.

Clinical trials

1
Pumpkin Seed Oil for Androgenic Alopecia — Cho 2014
PubMed

Double-blind RCT of pumpkin seed oil (400 mg/day) vs placebo in 76 men with androgenic alopecia for 24 weeks.

76 men with androgenic alopecia.

Pumpkin seed oil group: 40% increase in hair count vs 10% in placebo. Significant difference. Established pumpkin seed oil as evidence-based natural hair growth option.

2
Pumpkin Seed Oil for Overactive Bladder — Nishimura 2014
PubMed

Trial of pumpkin seed oil extract for OAB symptoms in 39 patients for 12 weeks.

39 OAB patients.

Reduced urinary frequency, urgency, OAB symptom scores vs baseline. Limited control; modest evidence.

Side effects and drug interactions

Common Potential side effects

Generally very well-tolerated.
Mild GI distress (rare).
Allergic reactions to cucurbits rare.
Bleeding risk minimal.
Headache rare.

Important Drug interactions

Anticoagulants — minimal effect; theoretical at very high doses.
5-Alpha-reductase inhibitors (finasteride, dutasteride) — theoretically additive for hair and prostate; consult prescriber.
Alpha-blockers — generally compatible; consult.
Hormone-sensitive conditions — minor theoretical concerns; generally safe.

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Frequently asked questions about Pumpkin Seed Oil (Cucurbita pepo)

What is the recommended dosage of Pumpkin Seed Oil (Cucurbita pepo)?

The clinically studied dose for Pumpkin Seed Oil (Cucurbita pepo) is 1-3 g/day pumpkin seed oil (typically 1,000-3,000 mg in capsules); 320-360 mg standardized extract for hair (Cho 2014). Always follow product labeling and consult a healthcare provider for personalized dosing recommendations.

What is Pumpkin Seed Oil (Cucurbita pepo) used for?

Pumpkin Seed Oil (Cucurbita pepo) is studied for bph symptom improvement, overactive bladder (oab) — both sexes, hair growth (androgenic alopecia). Multiple European trials show pumpkin seed oil/extract modestly improves BPH symptoms vs placebo. Friederich 2000 and others established evidence base. Effect smaller than alpha-blockers but reasonable adjunct in mild-moderate BPH.

Are there side effects from taking Pumpkin Seed Oil (Cucurbita pepo)?

Reported potential side effects may include: Generally very well-tolerated. Mild GI distress (rare). Always consult a healthcare provider before starting any new supplement, especially if you have underlying conditions or take medications.

Does Pumpkin Seed Oil (Cucurbita pepo) interact with medications?

Known drug interactions may include: Anticoagulants — minimal effect; theoretical at very high doses. 5-Alpha-reductase inhibitors (finasteride, dutasteride) — theoretically additive for hair and prostate; consult prescriber. Consult a pharmacist or healthcare provider if you take prescription medications.

Is Pumpkin Seed Oil (Cucurbita pepo) good for men's health?

Yes, Pumpkin Seed Oil (Cucurbita pepo) is researched for Men's Health support. Multiple European trials show pumpkin seed oil/extract modestly improves BPH symptoms vs placebo. Friederich 2000 and others established evidence base. Effect smaller than alpha-blockers but reasonable adjunct in mild-moderate BPH.