Can whey protein cause erectile dysfunction? There is no good evidence that it does. Protein supplements are not among the causes of erectile dysfunction that healthdirect lists — reduced blood flow, nerve problems, hormone problems, some medicines, chronic conditions and psychological factors. The real risk with gym supplements is what else a product might contain.
What causes erectile dysfunction, if not whey?
Most often something physical: reduced blood flow from clogged arteries, diabetes, high blood pressure, nerve problems, low testosterone (hypogonadism) or certain medicines — and sometimes stress, anxiety or relationship problems (healthdirect — Erectile dysfunction). Higher rates in older men "are usually due to other health conditions or medications, rather than ageing itself" (Healthy Male).
Does whey protein lower testosterone?
There is no reliable evidence that ordinary whey protein does. If you have low sex drive or erection problems, a GP can check your testosterone with a blood test rather than guessing at your diet.
What is the real risk with gym supplements?
Contamination and counterfeits. Protein powders are sports nutrition products, and the TGA warns that counterfeit supplements can contain ingredients not on the label — including illegal prescription medicines, substances banned in sport and toxic substances (TGA — Sports supplements in Australia). A product sold as a "testosterone booster" or with hormone-like claims is a bigger worry than a plain protein powder. Taking anabolic steroids alongside ED medicines is covered in can you take Viagra while on steroids?
What about creatine and diet?
The same questions come up for other gym staples and diets: does creatine affect erectile dysfunction? and can the keto diet lead to erectile dysfunction?
What actually helps?
healthdirect's prevention list is short: stop smoking, exercise more, lose weight and eat healthy food (healthdirect — Erectile dysfunction). Sleep matters too — see can lack of sleep cause erectile dysfunction? — and so does exercise, covered in can exercise improve erectile dysfunction?
The short answer
A plain whey protein powder is not a known cause of erectile dysfunction. If erection problems start, look at the usual causes with your GP, and be wary of supplements that promise hormone effects. More in our guide to lifestyle and erectile dysfunction.
