Zinc acetate, zinc glucose, zinc citrate, picolinate and any chelated forms. Chelated means bound to amino acids for better absorption. Those are all good for absorption. Zinc sulfate is bad and cause stomach irritation. Don't take your zinc with bran foods, protein, calcium or any other food that interferes with absorption. Multi vitamins usually have zinc and you should google what foods have zinc so you don't take too much. As with anything more is not always better. I take a zinc, magnesium supplement at night about 20 minutes before my greek yogurt or casein shake.