Originally Posted by Faemystique Subcutaneous is an injection in the fatty tissue of your abdomen, back of your arm or sides of your thighs. I recommend abdomen and staying at LEAST two inches away from your belly button as that area is very vascular. Needles are like insulin syringes, very fine high gauge with 1/2" needles. Pinch a bit of fat and go straight in. Rub a bit to distribute. Intramuscular are injections into the lateral portion (outer third) of thigh, deltoid muscle (three finger widths down ...