This is Dr. David
yes, I see the supplement
it does have some low dose caffeine
most likely it would be ok for him.
but it may or may not fix his weakness and low energy.
he needs to see his doctor to get blood testing to check thyroid hormone levels, B12, iron, ferritin, vitamin D levels, folate, magnesium, red blood cell levels to see if they are low.
he needs his H pylori infection to be treated
H Pylori in the stomach can keep his stomach from working properly and not absorbing proper nutrients.
he has to work on eating healthy and avoiding smoking and alcohol and make sure he drinks plenty of water
does he have a doctor he can see who can do some blood tests for him?
has he had his H Pylori treated?