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Many patients feel more energetic within 24 to 72 hours after receiving a B12 shot

Vitamin b12 deficiency symptoms can include peripheral neuropathy (numbness and tingling in the hands and feet), problems with balance and coordination, memory loss, trouble concentrating, changes in mental status, and depression, among other symptoms

It aids in the production of melatonin, which regulates sleep and wake cycles, as well as serotonin, which influences deep sleep and wakefulness

Research has demonstrated that extended pharmaceutical use often leads to the development of drug resistance (21, 40)

Diagnosing Vitamin B12 Deficiency Since hair loss and graying can result from many conditions, it's important to get the right medical tests and professional diagnosis

Symptoms may include: biotin hives (in rare instances) Skin rash (mild) Facial swelling Upset stomach Diarrhea Other Symptoms of Reactions to Too Many B Vitamins An overdose of B vitamins may cause an allergic reaction with symptoms that include: Skin Rash This might appear red with small bumps all over and itchy