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Several non-exclusive explanations are worth weighing, none of which requires assuming the rodent data were wrong

The other substance, called intrinsic factor, mixes with the stomachs contents and travels with them into the first part of the small intestine the duodenum

You're iron or folic acid deficient

Free from common additives such as lactose, fructose, gluten and gelatin

Munib may recommend bloodwork to confirm deficiency and establish baseline levels, though testing isn't always necessary for patients with clear symptoms or known absorption issues
