Dietary supplement S-adenosyl-L-methionine (AdoMet) effects on plasma homocysteine levels in healthy human subjects: a double-blind, placebo-controlled, randomized clinical trial.

OBJECTIVES To determine if exogenous S-adenosyl-l-methionine (AdoMet), a commonly used nutritional supplement, increases the level of plasma homocysteine (Hcy), a potential cardiovascular risk factor, in healthy human subjects. DESIGN Double-blind,... show more

OBJECTIVES To determine if exogenous S-adenosyl-l-methionine (AdoMet), a commonly used nutritional supplement, increases the level of plasma homocysteine (Hcy), a potential cardiovascular risk factor, in healthy human subjects. DESIGN Double-blind, placebo-controlled, randomized clinical trial. SETTING Mayo Clinic, Rochester, Minnesota. SUBJECTS Fifty-two (52) healthy human volunteers. INTERVENTION Subjects received placebo or AdoMet (800 mg per day) for 4 weeks. Hcy levels were measured before and after administration of AdoMet or placebo. OUTCOME MEASURES The primary outcome measure was change in Hcy level. Secondary outcome measures included an interim Hcy determination (at 2 weeks) and changes in levels of high-sensitivity C-reactive protein (hsCRP), lipids, and alanine aminotransferase. RESULTS There was no statistically significant change in Hcy between groups. Similarly, no statistically significant differences in change in Hcy or hsCRP levels were observed at 2 or 4 weeks. There was a small but statistically significant increase (p < 0.04) in alanine aminotransferase at week 2 and a statistically significant decrease (p < 0.04) in total cholesterol in the AdoMet group compared with the placebo group. CONCLUSIONS AdoMet at a daily dose of 800 mg for 4 weeks does not appear to significantly affect Hcy levels in the blood. show less