GLP-1 Nutrient Testing Guide

Know exactly what to test, when to test it, and what your results mean — with optimal ranges, Medichecks panel recommendations, and a symptom-to-test guide.
 
Most people on GLP-1 medications are never told which nutrients are being depleted — or that symptoms like hair loss, fatigue, cold hands, and low mood often have a straightforward nutritional explanation that a blood test can identify and a supplement protocol can fix.
This guide gives you the clinical testing roadmap that your prescribing doctor almost certainly won't. Based on published research including a 2026 review of nearly 500,000 GLP-1 users, it covers the eight biomarkers that matter most, explains what optimal levels actually look like (not just the NHS 'normal' range), and tells you exactly what to do if something comes back low.
What's included:
The 8 key biomarkers to monitor on GLP-1 medications — with NHS vs functional optimal ranges for each
A testing timeline: what to test before starting, at 6 months, at 12 months, and when symptoms appear
A symptom-to-test guide — hair loss, fatigue, low mood, plateau, cold intolerance, and more
Recommended Medichecks home blood test panels for each stage, with direct links
Supplement and food source guidance for each nutrient
A RAG (Red / Amber / Green) results interpretation guide
A note on MTHFR variants and why the form of your B vitamins matters
This guide is right for you if:
You're experiencing side effects you can't explain, you want to test before you supplement, or you simply want to know that you're monitoring the right things at the right times.