If you have a history of B12 deficiency, malabsorption issues, or are vegetarian/vegan with marginal B12 status, the weekly B12 injection provides protection during the high-risk period of rapid weight loss
If neurological symptoms are present (such as paraesthesia, ataxia, cognitive changes, or visual disturbances), more intensive treatment is required
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Therefore, intranasal administration, which bypasses the BBB and improves drug targeting, has become a popular route for investigating the therapeutic effects of natural products
(9, 10) When it comes to B12 supplements, if an IV drip feels a little invasive, the good news is you can get the same benefits in the form of shots (intramuscular injections), or oral capsules