beta-hydroxy-beta-methylbutyrate (HMB) supplementation in humans is safe and may decrease cardiovascular risk factors

Area of Science:

• Exercise Science
• Nutritional Biochemistry
• Human Physiology

Background:

• Beta-hydroxy-beta-methylbutyrate (HMB) is a leucine metabolite known to enhance exercise effects on muscle growth and strength.
• While animal and human studies suggest HMB safety, definitive quantitative human safety data are lacking.

Purpose of the Study:

• To summarize safety data from nine human studies involving daily HMB supplementation.
• To assess the impact of HMB on organ function, emotional perception, and overall health.

Main Methods:

• Nine human studies (3-8 weeks duration) with participants of varying ages and exercise statuses were analyzed.
• Safety was evaluated through blood chemistry, hematology, emotional profile testing (Circumplex), and a health questionnaire.
• HMB dosage was consistently 3 grams per day.

Main Results:

• HMB did not adversely affect any surrogate markers of tissue health or function.
• HMB supplementation led to significant improvements in negative mood indicators (Unactivated Unpleasant Affect).
• Compared to placebo, HMB decreased total cholesterol, LDL cholesterol, and systolic blood pressure, suggesting cardiovascular benefits.

Conclusions:

• Objective data from nine experiments indicate HMB is safe as an ergogenic aid for exercise.
• HMB supplementation appears to enhance objective health measures and subjective well-being.
• Potential cardiovascular benefits, including reduced risk of heart attack and stroke, warrant further investigation.