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"This information includes how they are manufactured, whether they are sterile, how they work in the body, what side effects they may cause and what substances these products actually contain." The regulator said examples of unapproved peptide products included those containing BPC157, GHKCu, TB500, retatrutide and CJC1295, often supplied in injectable form

Oral Pills Doctors are more likely to recommend injections when B12 levels are critically low or if you have a persistent issue that causes nutrient malabsorption

Subcutaneous injections can be less painful and easier to do yourself

The choice between PO and IM vitamin B 12 seems ideal for shared decision making

Subcutaneous injection sites: left abdomen, right abdomen, left thigh, right thigh