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By reactivating your body's own signaling systems, you can build a stronger, sharper, and more resilient version of yourself

This next part is the most important technical detail

This includes confirmed low serum vitamin B12 levels, pernicious anaemia, malabsorption states such as coeliac disease, inflammatory bowel disease, or post-gastric or bariatric surgery, unexplained anaemia, neuropathy or neurological symptoms consistent with vitamin B12 deficiency, a long-term vegan diet with symptoms or low levels, or failure of oral vitamin B12 supplementation

This depends on their B12 level and treatment needs

Many dietary supplements contain vitamin B12