@tillymack - I cannot remember the amount since it has been over 30 years since I took it regularly. I am very fortunate that I have always trained with weights either at home or at a gym for over 62 years (I will be 80 in December). In fact, I just finished a workout! My body shape, other than a little belly bulge, is pretty much the same and I have lost no muscle mass in my shoulders, chest or arms. I definitely have other problems but losing muscle mass for me is not one of them.