D-Ribose gives a huge boost to seniors.Combine that with this L-Carnitrate ,,,in the day time only ,,,(its too powerful . will keep you awake at night ) We seniors get a huge boost of energy huge ,,,no caffeine needed!!! Seniors listen up-- what ever you do --buy this !! Take after a walk preferable in the morning ,,,I;,m 83 ,,,,male ,,got the 2 Pfizers not about to get a booster,,this stuff is fantastic!!Memory comes back ,,,but you do have to walk,,,,,try to walk faster a fast walk for many reasons for 1 mile work up to a 45 minute every other day walk, 3x a week, i do 5 days a week, you won't believe how much better you feel,,focus, manage. You won't need any boosters ,,or Monkey Business shots,, as you will become very very healthy in one month !! L-Carnitine works wonders for seniors ,Gym fanatics, athletics that use ,,need energy !! Just try it ,then spread the word !!Amazon ,,sellers need to have capsules over powder as powder can easily be miss managed. Thanks !!!