Byetta & Vitamin B12
Depletes Vitamin B12. This medication is commonly used for Weight Loss
Why Byetta affects Vitamin B12
GLP‑1 receptor agonists, medications used for diabetes and weight management, can interfere with the absorption of vitamin B12, especially when they are used long term. Vitamin B12 is essential for healthy nerve function, red blood cell production, and normal hair growth, so deficiency may show up as fatigue, low mood, nerve issues, anemia, or increased hair shedding. Because of this, many clinicians recommend vitamin B12 supplementation alongside GLP‑1 therapy to help maintain overall health.
Clinical Evidence
Urbina J, Salinas-Ruiz LE, Valenciano C, Clapp B. Micronutrient and Nutritional Deficiencies Associated With GLP-1 Receptor Agonist Therapy: A Narrative Review. Clin Obes. 2026 Feb;16(1):e70070. Koceva A, Janež A, Pečko T, Jensterle M. Micronutrient Deficiencies in the Era of Second-Generation Incretin-Based Therapies for Obesity. Nutrients. 2026 Feb 19;18(4):677. Kanai R, et al. Once-weekly semaglutide administered after laparoscopic sleeve gastrectomy: Effects on body weight, glycemic control, and measured nutritional metrics in Japanese patients having both obesity and type 2 diabetes. Obes Pillars. 2024 Jan 3;9:100098. Sibal R, Balamurugan G, Langley J, Graham Y, Mahawar K. Macronutrient, Micronutrient Supplementation and Monitoring for Patients on GLP-1 Agonists: Can We Learn from Metabolic and Bariatric Surgery? Nutrients. 2025 Nov 23;17(23):3659. Karakoyun Ö, Ayhan E, Yıldız İ. Retrospective Review of 2851 Female Patients With Telogen Effluvium: A Single-Center Experience. J Cosmet Dermatol. 2025 Feb;24(2):e70037. Öner Ü, Akdeniz N. Nonscarring scalp alopecia: Which laboratory analysis should we perform on whom? Turk J Med Sci. 2022 Feb;52(1):188-194. Ramsay ID, Rushton DH. Reduced serum vitamin B12 levels during oral cyproterone-acetate and ethinyl-oestradiol therapy in women with diffuse androgen-dependent alopecia. Clin Exp Dermatol. 1990 Jul;15(4):277-81.
Recommended Replacement
Vitamin B12 (as Methylcobalamin) — 500 mcg
Related Health Impacts
- Memory Loss & Dementia
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.
Supplement Recommendation
Vitamin B12 Methylcobalamin by Pure Encapsulations — 0.2 mg
Other Nutrients Affected by Byetta
- Vitamin D3 — Depletion
- Zinc — Depletion
- Folic Acid — Depletion
- Calcium — Depletion
- Iron — Depletion
- Magnesium — Suppression
- Potassium — Suppression
- Vitamin B2 — Suppression
- Chromium — Suppression
- CoQ10 — Suppression
- Vitamin B6 — Suppression
Get Support
Prolonged use of Byetta can leave gaps in your nutrition. A targeted supplement can help restore balance while you continue treatment.
GLP-1 Support™
A bespoke formula designed to replenish the nutrients depleted by Byetta.
Once Daily Capsule · Rx Not Required
Learn More