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never, not needed, wastes T, creates opportunity for contamination, waste of $$
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no, reduces hydraulic pressure and increases injection times, also less accurate
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yes for IM and SC, depends on how lean you are
Some get lumps SC in belly fat and not SC upper legs, and some vise-verse. It is important for you to find out what works for you, little else matters.
This is a bit general. Anything more specific to your case needs to be in your other thread: Dizzy/Off Balance Feeling. Low Test, Hypothyroidism