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That probably depends on your body fat percentage. I inject in the quads and 1/2" is plenty long to do IM. I am not especially lean yet  the muscle is clearly visible under just a thin layer of skin & tissue. I used to spread the skin a bit with my thumb and forefinger and I imagine that could help a person with a higher amount of fat.


It will be interesting to see if others know of a way to determine how deep one has to go to reach the muscle in people with varying body fat percentages.


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