can i inject b12 and testosterone together Mixing One Syringe Which needle should I use

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 How to do an Intramuscular Testosterone Injection Optimale Vitamin B12 Injection Sites: All You Need to Know Giving yourself a B12 or testosterone injection? Proper technique and rotating injection sites can help reduce discomfort and support safer administration. Always use sterile precautions and follow

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