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They do not hijack your biology

There many therapies with regards too the biogenic type injection therapy
It also states this applies to ads for all vitamin shot products, not just vitamin D or vitamin B12

Many cheap supplements use magnesium oxide, which is poorly absorbed and often causes digestive discomfort

Yes, there are specialized B12 injections like Tiaminal B12

The PRISMA 2020 statement: An updated guideline for reporting systematic reviews
