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Which needle should I use for each injection. Insulin syringe: Most peptides are except Cerebrolysin NAD Can use for testosterone or can be intramuscular (buttock) Intramuscular (larger needle) B12 Testosterone Glutathione Carnitine Insulin Syringes Disposable Insulin Syringes Mountainside Medical Tagged "Small Needle" BD Veo Insulin Syringes With BD Ultra Fine 6mm Needle (100 ct.) b12 injections im or subq Insulin Syringe Sizes Explained: A Complete Guide for Beginners
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