Depletes Vitamin B12. This medication is commonly used for Diabetes
Long term treatment with Biguanides, such as Metformin or Metformin combinations with other drugs, are found in research to reduce vitamin B12 absorption due to it hindering the activity of a calcium-dependent mechanism. Insufficient levels of vitamin B12 can lead to higher circulating homocysteine levels and the elevated risk of neurological problems and cardiovascular diseases.
Pongchaidecha M, Srikusalanukul V, Chattananon A, Tanjariyaporn S. Effect of metformin on plasma homocysteine, vitamin B12 and folic acid: a cross-sectional study in patients with type 2 diabetes mellitus. J Med Assoc Thai. 2004 Jul;87(7):780-7. PMID: 15521233.de Jager J, Kooy A, Lehert P, et al. Long term treatment with metformin in patients with type 2 diabetes and risk of vitamin B-12 deficiency: randomised placebo controlled trial. BMJ. 2010;340:c2181. Published 2010 May 20. doi:10.1136/bmj.c2181. Sato Y, Ouchi K, Funase Y, Yamauchi K, Aizawa T. Relationship between metformin use, vitamin B12 deficiency, hyperhomocysteinemia and vascular complications in patients with type 2 diabetes. Endocr J. 2013;60(12):1275-80. doi: 10.1507/endocrj.ej13-0332. Epub 2013 Sep 8. PMID: 24018893. Carpentier JL, Bury J, Luyckx A, Lefebvre P. Vitamin B 12 and folic acid serum levels in diabetics under various therapeutic regimens. Diabete Metab. 1976 Dec;2(4):187-90. PMID: 1017538.
Vitamin B12 (Methylcobalamin) — 100mcg
Vitamin B12 deficiency is strongly associated with cognitive impairment, including problems with memory, attention, and executive function, and is considered a reversible cause of dementia when caught early. Low or borderline B12 levels are more common in older adults, particularly those with atrophic gastritis, long-term use of acid-suppressing medications, or vegetarian/vegan diets, and studies show that deficient individuals often perform worse on cognitive tests than those with adequate status. Clinically, correcting B12 deficiency can lead to measurable improvements in cognition and mood in some patients, which is why B12 levels are routinely checked in the evaluation of cognitive decline and suspected dementia.
In older adults, low folate status has been associated with a higher risk of mild cognitive impairment (MCI) and faster cognitive decline over time, likely through effects on one‑carbon metabolism and homocysteine. Several longitudinal cohort studies have found that individuals with lower serum or red‑cell folate and higher homocysteine show steeper declines on memory and global cognition tests, and in some cohorts have a significantly higher incidence of MCI or dementia over follow‑up. The clinically important takeaway is that, when folate deficiency is detected and corrected (usually along with ensuring adequate vitamin B12), some patients demonstrate stabilization or modest improvement in cognitive performance, particularly when interventions are combined with aggressive management of vascular risk factors such as hypertension and diabetes.
Vitamin B12 Methylcobalamin by Pure Encapsulations — 0.2 mg