GLP-1 Vitamin Deficiencies and How to Prevent Them
The most common vitamin and mineral deficiencies on GLP-1 medications — and the supplements that prevent them.
Sustained calorie restriction on a GLP-1 medication is the perfect setup for nutrient deficiencies. The earliest signs — fatigue, brain fog, hair shedding, leg cramps, mouth sores — are often blamed on the medication when the real cause is a missing vitamin or mineral.
Here are the deficiencies that show up most often on GLP-1 medications and how to head them off.
The top GLP-1 deficiencies
- Iron — fatigue, pale skin, hair shedding, cold hands and feet
- Vitamin B12 — fatigue, brain fog, tingling in hands or feet
- Vitamin D — low mood, muscle weakness, frequent illness
- Magnesium — leg cramps, poor sleep, constipation, anxiety
- Potassium — leg cramps, weakness, heart palpitations
- Protein — muscle loss, hair shedding, slow wound healing
How to prevent them
A daily multivitamin covers most baseline needs. Add magnesium glycinate at night, a daily electrolyte for sodium and potassium, and a protein source with every meal. Ask your provider for a basic blood panel — ferritin, vitamin D, B12, and a CMP — every 6–12 months while on a GLP-1.
Frequently asked questions
Which deficiency causes GLP-1 fatigue?
Iron and B12 are the most common drivers of fatigue on a GLP-1. Vitamin D and inadequate protein are close behind. A blood test is the only way to know for sure.
How often should I get blood work on a GLP-1?
Every 6–12 months is a reasonable cadence. Ask for ferritin, vitamin D, B12, CBC, and a comprehensive metabolic panel at minimum.
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