Hello I am taking growth hormone Saizen and I want to know if I can take Niacin and Melatonin. Is it o.k for me to take those together with the growth hormone

Melatonin is a sleep aid helping you go to sleep. This is not recommended for people under 18 or who have certain health problems. The Niacin... what are you specifically taking niacin for?

If in doubt you need to ask your doctor the next time you go there.