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More serious B12 deficiencies have the potential to impair heart and neurological function, leading to a wide range of serious symptoms, including but not limited to tinnitus, severe joint pain, memory problems, depression, anxiety, poor muscle function, ataxia and changes in reflexes

May also help stimulate the immune system, ease muscle cramps, and aid in the management of arthritis, allergies, and asthma

Reported side effects in humans Clinical experience and user reports suggest that side effects, when they occur, are generally mild

Wellness 19 May 2026 6 min read How long do B12 injections last

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