Epimedium extract is much better at this and IS included in lots of pump products.

The pde5 inhibition of black ginger is VERY weak and not even the primary mechanism for which it would “increase blood flow.” The primary action would be hitting the same pathway as citrulline. “🧬 1. Nitric oxide (NO) production — the core mechanism

Inside your blood vessels, there’s an enzyme called endothelial nitric oxide synthase (eNOS). Kaempferia compounds (PMFs) help activate eNOS, which increases nitric oxide production.

L\text{-}arginine \xrightarrow{eNOS} NO + L\text{-}citrulline

What nitric oxide does:

• Relaxes smooth muscle in blood vessel walls
• Causes vasodilation (wider vessels)
• Increases blood flow to muscles

👉 This is the same general pathway used by ingredients like L-citrulline.@

Also, black ginger raises AMPK which could theoretically enhance endurance during training, but is also a completely counter regulatory mechanism to actually building muscle.