Yep, this is easy. Drop the vitamins.
Fix ya diet. More greens, fruits. Raw as much as possible. Snack on berries and NUTS. Don't drink soda or energy drinks. Spoon full of honey every morning and night.
Each day blend up 1 banana, 1 apple, frosen blueberries, frozen mango, honey, 1 cup of yogurt. Drink it. You'll feel full and you have just killed the need for a vitamin but way better.
That with the other things, like some volume workout.. for you.. light weights and more reps targeting the pain areas. Get a hand gripper, a light one.... that will rehabilitate the hand. It has to be light stress with more rep. That's rehab.
Do that for 2 months you won't have anymore hand pain and shit like that. It'll be a thing of the past.
Goodluck?