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B12 shots are safe for most people, but those with certain health conditions should consult a doctor before starting treatment
Vitamin injections can also prove beneficial for patients with certain symptoms and conditions, such as chronic pain, fatigue, headaches, insomnia, allergies, digestive problems, asthma, and diabetes
PMID 27886704
In general, vitamin B complex supplements, including Neurobion products, can help treat or prevent the deficiency of some nutrients
And on a side note we also have a much better understanding of why our metabolism slows down as we get older