I'm currently trying to weigh the differences between VitaMedica and Heal Fast and determine which to use (my surgery is in June, so I have time). My surgeon said both are good to take pre- and post-op, and I know they both are formulated for surgery and do not contain Vitamin E, which has to be avoided pre-op since it's a risk for bleeding.

My surgeon also said I can use "CF(Preop)"(https://www.amazon.com/CF-Preop-Drink-2-Pack-Strawberry/dp/B08CS1NHBH?ref_=ast_sto_dp), which is supposed to help your body through the day of surgery since it helps alleviate some of the stress from dehydration and lack of nutrients, so you might want to look into that too.

Obviously, ask your surgeon first, since they might have different recommendations, though.