With reduced food intake, GLP-1 users are at risk for micronutrient deficiencies. A daily multivitamin is the simplest insurance policy. This guide covers why you need one and which to choose.
Why GLP-1 users need a multivitamin
GLP-1 medications suppress appetite, which means most users eat significantly less food. While this is the goal for weight loss, it also means fewer micronutrients from food. Common deficiencies in GLP-1 users include:
- B vitamins (especially B12 — GLP-1s may reduce absorption)
- Vitamin D (already commonly deficient in general population)
- Iron (especially menstruating women)
- Magnesium (already commonly deficient)
- Zinc (affects taste, immune function)
- Calcium (especially if reducing dairy)
Even with careful food choices, hitting 100% DV of all micronutrients on a reduced-calorie diet is challenging. A daily multivitamin is the safety net.
What to look for
1. Complete coverage
Look for vitamins that provide 100% DV of most nutrients. Avoid "mega-dose" formulas — excess fat-soluble vitamins (A, D, E, K) can accumulate.
2. Bioavailable forms
- B12 as methylcobalamin (better absorbed than cyanocobalamin)
- Folate as methylfolate (better than folic acid for some people)
- Iron as ferrous bisglycinate (gentler than ferrous sulfate)
- Magnesium as glycinate or citrate (better than oxide)
3. Third-party tested
Look for USP, NSF, or ConsumerLab verification. Supplements aren't FDA-regulated like medications, so third-party testing ensures what's on the label is in the bottle.
4. Appropriate for your needs
- Women (menstruating): With iron
- Men and postmenopausal women: Without iron (excess iron is harmful)
- Vegans/vegetarians: Ensure B12, iron, zinc are well-covered
- Seniors: Higher B12, vitamin D; lower iron
Our top picks
Garden of Life Vitamin Code Raw One — Women, 75 Capsules
Whole-food multivitamin that covers the most common GLP-1 micronutrient gaps in a single daily capsule — including B-vitamins, vitamin D, and iron.
$25–32Check Price on Amazon
Garden of Life Vitamin Code Raw One — Men, 75 Capsules
Men's whole-food multivitamin covering 18 essential nutrients at 100% DV. One capsule daily covers common GLP-1 micronutrient gaps without iron.
$25–32Check Price on Amazon
Why Garden of Life Vitamin Code Raw One
- Whole-food based (better absorption)
- Includes probiotics and enzymes
- Once-daily dosing
- Non-GMO, gluten-free
- Separate formulas for men and women
- Reasonable price (~$0.35/day)
How to take
Timing
- Take with food (improves absorption, reduces stomach upset)
- Take with breakfast or lunch (avoid evening — B vitamins can disrupt sleep)
- Take at the same time daily for habit
What to take with
- Water (8+ oz)
- Food containing some fat (for fat-soluble vitamins)
- Avoid taking with coffee or tea (tannins reduce absorption)
- Avoid taking with calcium supplements (interferes with iron absorption)
What to add
A multivitamin doesn't cover everything GLP-1 users need. Add:
- ☀️ Vitamin D3 — most multivitamins have too little
- 💊 Magnesium glycinate — most multivitamins have too little
- 💊 B12 — if levels are low or you're on GLP-1 long-term
- Omega-3 — if you don't eat fish 2-3x/week
Before starting supplements, get bloodwork done. Knowing your actual deficiencies lets you target supplementation appropriately. See our lab tests guide.
FAQs
Can I take a multivitamin on an empty stomach?
You can, but it may cause nausea (especially iron-containing formulas). Take with food for best absorption and to reduce stomach upset. This is particularly important on GLP-1s where nausea is already a concern.
Should I take iron in my multivitamin?
Only if you're a menstruating woman or have documented deficiency. Men and postmenopausal women should choose iron-free formulas. Excess iron is harmful.