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Sildenafil [Viagra], 25mg/day orally, Increases Muscle Protein Synthesis to a similar

what it claims

The community is exploring the idea that sildenafil (Viagra), due to its vasodilatory properties, could stimulate muscle protein synthesis and reduce fatigue to a level comparable to certain hormonal supplementations.

overstated

The thread is based on a very small pilot study (n=11) published in 2013, which suggests an increase in protein synthesis via modulation of cGMP signaling.

noli's read

The thread is based on a very small pilot study (n=11) published in 2013, which suggests an increase in protein synthesis via modulation of cGMP signaling. It is crucial to note that this study is small and has not been widely replicated, which significantly limits the scope of its conclusions. While the vasodilatory effect of PDE5 inhibitors is well documented (systematic review, Cochrane), their direct impact on long-term muscle hypertrophy in humans remains speculative and has not been demonstrated by robust clinical trials. Online users are demonstrating welcome caution regarding the sample size, while enthusiastically exploring potential benefits for muscle pumps and blood pressure. However, moving from a theoretical biological mechanism to a generalized muscle-building practice is an unvalidated extrapolation. The community is generally curious but cautious, oscillating between humor, methodological skepticism, and an interest in personal experimentation.

the sources

  1. 1Rosano GMC, Aversa A, Vitale C, Fabbri A, Fini M, Spera G 2005
  2. 2r/AdvancedFitness

Claimed by r/AdvancedFitness. Noli grades the claim, never the person.

Decoded by Noli · July 18, 2026 · the original post

What the graded evidence says

Evidence
C
Effect
endothelial function (flow-mediated dilation) vs. longevity outcomes — Chronic tadalafil improved endothelial function in men with increased cardiovascular risk (controlled study). This is a surrogate vascular marker in selected patients; no evidence of longevity or healthy-population anti-aging benefit.
Measured on
men with cardiovascular risk factors or BPH/LUTS; not healthy longevity-seekers

What’s uncertain

The endothelial benefit is in specific patient groups and is a surrogate marker, not a longevity outcome. Off-label anti-aging use is unproven, and the nitrate interaction is genuinely dangerous — this is a clinician-supervised decision.

r/AdvancedFitness in the Register33 claims graded · solidity 66/100See their record →

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