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One study found that compounded drugs were responsible for 45 percent of drug recalls in the US between 2012 and 2021, despite accounting for just 1 to 3 percent of prescriptions

FDA adopted the same defined fragment in its 2026 review

With age, the decrease in stomach acid secretion and the quantity of the digestive enzyme pepsin results in diminished absorption of vitamin B12

Some individuals who have deficiencies caused by lack of absorption during digestion respond better to vitamin B12 injections as they are absorbed directly into the body

A handful of human trials have been registered -- some in Croatia, where most of the original research originated -- but published results are sparse and methodologically limited