The best supplement for maintaining or increasing muscle mass without adding calories is an essential amino acid supplement. These provide necessary amino acids for muscle repair and growth without significant calorie addition. Other options listed do not effectively meet the client's goal. ;
The best supplement for maintaining or increasing muscle mass without adding calories is an essential amino acid supplement. These provide necessary nutrients for muscle growth and repair without significantly adding calories. Other options such as androstenedione, tribulus terrestris, and guarana do not effectively meet this goal.
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