Which the best form of vitamin or vitamins is good for promoting healing/ recovery?

It's the amount : There is no ideal form, or one specific vitamin. Vitamins like to work with others, so taking more of 'just one' isn't as good as taking a mutilple vitamin. If you are talking about healing after a surgery or burn, then for awhile higher than rda amounts may be useful - the body needs more - and more protein - during repair time.

Multivitamin,Vit. C: Healing from what? Start with a good multivit. See http://www.Multivitaminguide.Org/ any of the top 30 on that list are good. My personal favs include ultranutrient by pure encapsulations (not on the list), ultrapreventive x, life force multiple & advanced nutritional system. Extra c (1-2, 000 mg/day) & d (total 5000 iu/day in fall/winter) help too.Consider a herbal tonic like rhodiola or cordyceps.