Lab Monitoring
Nutrients
GLP-1 Nutrient Deficiency Panel: What to Test
Eating less means every bite counts. Here is how to ensure you are getting the nutrients you need while on GLP-1 medication.
Last updated: April 1, 2026-10 min read
Dramatically reduced food intake on GLP-1 medications is the mechanism that produces weight loss -- but it also creates risk for nutrient deficiencies if not monitored and supplemented appropriately. Understanding which nutrients to test and supplement is essential for long-term health on GLP-1 therapy.
Nutrients Most at Risk
Nutrient Panel for GLP-1 Patients
| Nutrient | Why at Risk | Supplement | Test |
|---|---|---|---|
| Vitamin D | Reduced dietary intake; fat-soluble | 2000-4000 IU daily | 25-OH Vitamin D |
| Vitamin B12 | Reduced intake; metformin interaction | 1000 mcg daily | Serum B12, methylmalonic acid |
| Iron | Reduced meat intake | As needed per labs | Ferritin, iron, TIBC |
| Zinc | Reduced overall intake | 15-30 mg daily if low | Serum zinc |
| Folate | Reduced dietary sources | 400-800 mcg daily | Serum folate |
| Calcium | Reduced dairy intake | 500-1000 mg daily | Serum calcium, bone density |
| Magnesium | Reduced overall intake; GI losses | 200-400 mg daily | Serum magnesium |
Warning Signs of Deficiency
Watch for These Symptoms
- - Fatigue beyond expected: May indicate iron, B12, or D deficiency
- - Hair thinning: Often related to iron, zinc, or protein deficiency
- - Muscle cramps: May indicate magnesium, potassium, or calcium issues
- - Numbness/tingling: B12 deficiency warning sign
- - Frequent illness: Zinc or vitamin D deficiency
- - Brittle nails: Iron or biotin deficiency
Minimum Supplement Recommendations
Standard GLP-1 Supplement Stack
- Daily multivitamin (high-quality, complete formula)
- Vitamin D3: 2000-4000 IU daily
- Vitamin B12: 1000 mcg daily (especially with metformin)
- Calcium + Vitamin K2: for bone health (especially over 50)
- Protein supplement: to meet 1.0-1.2g/kg daily target
Comprehensive Care Includes Nutrition
Trimi physicians monitor nutrients alongside weight loss. Semaglutide $99/mo. Tirzepatide $125/mo.
Get StartedMedical Disclaimer
Supplement recommendations are general guidelines. Individual needs vary based on lab results, diet, and medical history. Do not start high-dose supplements without provider guidance. Consult your healthcare provider.
More on GLP-1 lab monitoring
Sources & References
- Wilding JPH et al. Once-Weekly Semaglutide in Adults with Overweight or Obesity. NEJM 2021;384:989-1002.
- Jastreboff AM et al. Tirzepatide Once Weekly for the Treatment of Obesity. NEJM 2022;387:205-216.
- Lincoff AM et al. Semaglutide and Cardiovascular Outcomes in Obesity without Diabetes. NEJM 2023;389:2221-2232.
- FDA Prescribing Information for Wegovy (semaglutide) and Zepbound (tirzepatide).