Answer:
Vitamin E: Inhibits wound healing, decreases tensile strength, decreases amount of collagen produced; topical application not shown to have any effect.
Zinc: In absence of a deficiency has no benefit, considered a cofactor for collagen production.
Aloe vera and cocoa butter: Neither have been shown to have any effect on scar formation. As long as they are applied after the wound has completely healed, there is no problem with their use. Massaging may soften wounds. Topical preparations of these substances may be used as sunblock.