Pine bark extract is a polyphenol supplement made from the bark of the French maritime pine tree (Pinus pinaster). The standardized version, sold under the brand name Pycnogenol, has over 160 human clinical trials behind it, more than almost any other natural compound.

People take it for three main reasons: men use it (usually stacked with L-arginine) to support erections and circulation, women use it for hot flashes, period pain, and skin elasticity, and both sexes use it for joint comfort, leg circulation, and general vascular health as they age. The throughline is that it makes blood vessels work better (Endothelial NO / vasodilation), dampens inflammation (NF-κB inhibition), and protects connective tissue. None of the effects are dramatic in the first week, most people notice something around weeks 4-8, and the bigger structural changes accumulate over months.

Deep-dive

Dosage:

• General vascular and skin support: 50-100 mg/day, typically split into two doses with meals
• Higher therapeutic doses (osteoarthritis, hypertension, cognitive support, perimenopause): 100-200 mg/day, split into 2-3 doses
• Menstrual pain and endometriosis: 60 mg/day starting 7 days before menstruation and continuing through. Some protocols use 30 mg twice daily continuously across cycles
• Erectile dysfunction (men): 80-120 mg/day Pycnogenol stacked with 1.5-3 g/day L-arginine aspartate. The combination matters, neither component alone produces the same effect
• ADHD (children): 1 mg/kg/day
• Timing: Take with food. Polyphenol absorption is improved with a small amount of fat in the meal. Splitting the dose across the day gives more even plasma metabolite levels than a single dose
• Onset: Allow 4-6 weeks before judging effects. Vascular and skin changes accumulate. Menstrual pain effects show up by the second cycle. Hot flash improvements typically by week 4
• Cycling: Most studies run 8-12 weeks continuously. Long-term safety has been studied out to 30 months in some trials without issues. Cycling isn't required, though some people pause every few months to reassess whether they still need it
• Quality: The trial data applies to Pycnogenol specifically. If you buy generic pine bark extract, look for products that specify Pinus pinaster from the southwest French coast and standardize to roughly 70% procyanidins. Cheap generics from other pine species or other regions don't have equivalent evidence

Here's what you can expect:

In the first 2-3 weeks, most people feel nothing dramatic. Some notice slightly better leg circulation, less afternoon leg heaviness, or a vague sense of being less puffy. This isn't placebo, the vascular changes are slow because the compound works by improving how endothelial cells regulate themselves rather than acutely dilating vessels.

By weeks 4-8, the more noticeable effects show up. Women with perimenopausal symptoms typically report fewer and less intense hot flashes around week 4. Skin tends to look slightly more hydrated and elastic by week 8-12. Men using it with L-arginine for erectile function generally see meaningful improvement by month 2. Joint comfort in mild OA tends to build gradually rather than suddenly.

Things you probably won't notice: a stimulant-like cognitive lift, a sharp drop in blood pressure, anything that feels like a drug. If you go in expecting subjective fireworks, you'll be disappointed. The win with this compound is the structural improvements, vessels that work better, skin that holds onto more water, vasomotor symptoms that don't escalate, joints that complain less, that compound over months and years rather than weeks.

If nothing has changed by 12 weeks at an adequate dose (at least 100 mg/day for most uses), it probably isn't going to.