I have D-Ribose and D-Ribose Corvalen (with Malic and MAgnesium). I am finding that after four days of D-Ribose Carvalen I am feeling tired. I put this down to the possible reason that Magnesium is making me tired and messing with my salt levels. I just took some salt water and that gave me a real boost. Do you think its the magnesium? And, what should I be looking out for when taking D-Ribose? Does it deplete anything?