The best way to inject anabolic steroids is to do it intramuscularly. Intravenous injections should be strictly avoided. There are nine muscle groups and their corresponding sites, where anabolic steroids may be injected. The nine groups of muscles are glutes, biceps, lats, deltoids, triceps, quadriceps, pectorals, calves, and traps. There are 17 injection sites, but because the muscles mentioned here have corresponding muscles on the other side of the body, so in total these steroids can be injected in 34 sites. Here is more about the muscles and injection sites.
Glutes Select a spot, two inches under the lower back and a few inches to the left if you want to inject into the left glute. The spot is the same for the right glute also. Never inject into the buttocks directly, because you may injure the sciatic nerve.
Biceps The center of the biceps, either on the inside or the outside, is a good place to inject.
Lats There is only one spot on each of the lats. Find the outer edge of the muscle and inject into its center.
Deltoids While there are three sites on the deltoids, the most suitable one is the lateral deltoid head.
Triceps There are three sites on the triceps – the outer head, the lower rear head, and the middle rear head. You can inject into the center of each area.
Quadriceps There are two sites on the quadriceps. The sweep is the best area to inject. Choose an area between the middle of the knee and the hip, a little to the outside, and inject.
Pectorals There are three points in the pectorals – the upper inside, the middle inside, and the outer lower. All three areas are suitable, though the outer lower may be a little uncomfortable.
Traps There is single spot, on each side of the traps. Inject into the middle.
Calves You can inject into the center of the outer or inner head. Most people are not comfortable injecting into this site. Only inject here if it is absolutely necessary.
Of all these points, the glutes and the lateral head of the deltoids are the most suitable points. It is not recommended to inject anabolic steroids into the traps and the calves, because it can be painful. Whichever area you choose to inject, maintain sanitation. Never re-use syringes or needles and never share it with others. Before you inject, sterilize the area with alcohol.