3ml bac water Bacteriostatic UK | Best Sterile Research Solution 13 Slots Dual-Size 30ml and
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The shoulder is a common site for injections to manage pain from injury or trauma

You can check your B12 levels with a blood test

It could be that you need to address a vitamin deficiency

Blood thinners: If you take medications like warfarin, aspirin, or newer anticoagulants, alcohol can intensify their blood-thinning effects