I was thinking:
1) Protein powder helps build muscles
2) d-Ribose and ATP helps muscular activity (I came across d-Ribose because it specifically helps the heart muscle.)
Let's say a bicep muscle has one type of tissue but tissues of organs have different tissues. So, it seems plausible that bio-chemists could come up with a supplement that feeds heart muscles with more precision.
Jack LaLane eventually died, yes.
As I make sure to get enough protein during my 40s and 50s; and, as I plan financially for food intake in my 50s-90s; and, since supplements I see as necessary for that age range aren't covered by the nutritional guidelines for government programs, I thought I would ask about adding d-Ribose to the weekly groceries.