TESTOSTERONE CHEAT SHEET Boron 6 10 mg day L carnitine 2 g day Zinc 15 30 mg day Copper 1 2 mg day Manganese 1 2 mg day Selenium 200 mcg day Magnesium 200 mg day Vitamin L Carnitine Benefits for Male Erectile Dysfunction Does L Carnitine Increase Testosterone? Evidence Based Review of Its E Herbolab L Carnitine Libido: What the Research Actually Shows L Carnitine Erectile Dysfunction: What the Evidence Actually Shows