Quick Answer
Four things make the biggest difference: 1) Keep the wound clean and moist with daily gentle washing and petrolatum. 2) Don't pick at scabs or sutures. 3) Stop smoking, which significantly slows wound healing. 4) Keep your blood sugar well-controlled if you have diabetes. Vitamin C and protein support healing, but mega-dosing supplements doesn't accelerate it beyond what an adequate diet provides.
This question comes up frequently for patients researching suturing & wound care at Good Health NC in Knightdale, NC.