Take home message Glutamine is an important amino acid that plays many roles in our bodies regardless of our level of exercise
Robert Kushner, professor of medicine at Northwestern University's Feinberg School of Medicine and a leading obesity medicine specialist, on an episode of the A Whole New Level podcast
On the other hand, a study with a different design, namely a randomized, double-blind, placebo-controlled crossover comparison clinical trial, and partially different cohort and methodologies demonstrated that daily oral administration of very low doses (1.5 g/day) of l-ARG for a very short time (17 days) did not improve patients satisfaction with their penile erectile function and their sexual life, analyzed by the standardized KEED questionnaire for ED, in 30 middle-aged men affected by ED of mixed etiology and severity [29], suggesting that higher doses and longer-term supplementation might be required, or that l-ARG might be of particular benefit in subtypes of ED, such as those of vasculogenic etiology
However, we used new users as a cohort to reduce the potential for unmeasured confounding
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