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These materials are not classified as drugs, pharmaceuticals, dietary supplements, or medical products

Viscous (oil-based or crystalline) medications, such as certain antibiotics or hormones, require a 22-G or 23-G needle to prevent the syringe from clogging and to allow for smooth plunger operation

A muscle spasm (Charley horse) can cause sudden, sharp pain, tightness, and involuntary muscle contraction, ranging from mild discomfort to intense pain

The most common side effect is nausea, which occurs in about 40% of users

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Actin is a structural protein that plays a central role in cell movement and organization