Then the obvious, no smoking, drugs, drinking. No
Accutane, if you are taking any acne medicine
with a Vitamin A derivative. Then, dump the extra "empty calories," the sugars and carbs that you should stay away from anyway, and eat a really balanced diet of lean meats, fruits, veggies, milk. Stay away from fish that might have heavy metals. (Sometimes that is tricky. Wild-caught salmon from Alaska is a yes, farmed salmon from the Atlantic is a no.