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Oral B12 absorption can be hindered by digestive limitations

[26] [27] [28] Among other problems, weakened immunity, reduced fertility and interruption of blood circulation in women may occur

Its popular because it lasts longer

Effect of Age, Sex and Body Weight on the Serum Concentrations of Cobalamin and Folate in Cats Consuming a Consistent Diet

Absorption Issues from GI Conditions and Surgery Other health issues can throw up similar roadblocks to B12 absorption, making long-term injection therapy the only effective solution

Those with B-12 deficiencies may experience brain fog, memory problems, or mood disturbances, which can be mitigated with regular injections