hi thank for your query first off all you should discourage for taking steroid for purpose of body building these are not made for this. Nandrolone decanoate injection is intended for deep intramuscular injection only, into the gluteal muscle preferably. Dosage should be based on therapeutic response and consideration of the benefit to risk ratio. Duration of therapy will depend on the response of the condition and the appearance of adverse reactions. If possible, therapy should be intermittent. Nandrolone decanoate should be regarded as adjunctive therapy and adequate quantities of nutrients should be consumed in order to obtain maximal therapeutic effects MOST COMMON SIDE EFFECTS-- Acne; enlarging penis; increased frequency of erections; unnatural hair growth; hoarseness or deepening of voice; unnatural hair growth Seek medical attention right away if any of these SEVERE side effects occur: Bone pain; nausea or vomiting; sore tongue; swelling of feet or lower legs; unusual bleeding; unusual weight gain; purple- or red-colored spots on body or inside the mouth or nose; sore throat and/or fever; vomiting of blood;