Some supplements - ginkgo, L-arginine, DHEA, yohimbe - are marketed as "natural Viagra." Evidence is limited, product quality varies, and interactions or side effects can be serious. Talk with your clinician before trying them.
Erectile dysfunction should be evaluated medically before using pills or supplements. PDE5 inhibitors are effective for many men, but supplements have limited evidence and can carry real risks and drug interactions.
Circulation problems rise with age and lifestyle. Learn common causes (atherosclerosis, varicose veins, Raynaud's), practical steps to protect circulation, and what evidence says about cayenne, ginkgo, garlic, ginger, and onion - plus safety cautions.