b12 injections forum How Quickly Do You Feel Better After Injections? How Long Do B12 Injections

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No idea if that's actually the cause

Youre concerned about long-term supplementation or vitamin use

Three areas create the clearest red flags: The subdeltoid bursa which reacts with inflammation when vaccine material enters the space, often creating significant swelling The rotator cuff tendons which produce more pain during lifting motions or outward rotation The joint capsule which can stiffen rapidly if trauma or inflammation develops These structures do not follow the timeline seen in normal arm soreness

Subcutaneous injection can be administered systemically (abdomen, thigh) or locally (scalp)