Pine Bark Extract (Pycnogenol) for Libido And Sexual Function

Research suggests that Pine Bark Extract (Pycnogenol), particularly when combined with L-arginine, may improve erectile function and related measures of sexual satisfaction in men with mild to moderate erectile dysfunction, with one randomized controlled trial and a 2023 meta-analysis pooling data from three trials both reporting statistically significant improvements across multiple sexual function domains. Studies indicate that the proposed mechanism involves Pycnogenol's antioxidant and vascular effects, which may support nitric oxide production and blood flow, though testosterone levels do not appear to be meaningfully affected by the combination. However, the overall body of evidence carries important limitations: two broader systematic reviews — one a Cochrane-style analysis from 2020 and another from 2012 — rated the certainty of evidence for pine bark extract across all conditions, including erectile dysfunction, as very low, citing small sample sizes, inconsistent outcome measures, and concerns about study quality. A 2018 meta-analysis on herbal supplements for erectile dysfunction similarly found the research landscape too limited to support firm clinical recommendations for any single herbal supplement, meaning that while the early findings for Pycnogenol and L-arginine are directionally promising, more rigorous and larger trials are needed before strong conclusions can be drawn.