Magnesium supplementation on GLP-1 — need advice

sophie_paris said:

Two litres a day, no added salt, and a persistent headache that I spent a month attributing to the medication.

Muscle cramps on hydration — anyone else? I was getting severe leg cramps at night, especially calves. Bloodwork showed my both mag and potassium was low.

GLP-1 agonists can cause electrolyte shifts due to reduced food intake and GI effects. Get your electrolytes checked and supplement accordingly. I take magnesium glycinate 400mg + potassium gluconate 99mg daily and cramps are gone.

Dr.SportsMedIN said:

Muscle cramps on hydration — anyone else?

Helpful anti-nausea foods for hydration users:

• Ginger (tea, chews, supplements — all work)
• Peppermint (tea or oil capsules)
• Plain crackers or rice cakes
• Bananas (easy to digest, replenish potassium)
• Clear broth (hydration + sodium)
• Small amounts of protein (chicken breast, plain Greek yogurt)

Avoid: greasy foods, spicy foods, large meals, lying down after eating. Keep meals small and frequent — I do 5-6 mini meals/day.

sophie_paris said:

Two litres a day, no added salt, and a persistent headache that I spent a month attributing to the medication.

Can confirm. Same sequence, different timescale. The detail I would add is minor and it is already implied above.

Adding the clinical framing, because it changes how the question reads.

Electrolyte monitoring on hydration — especially important during early titration when GI effects are most pronounced:

• Sodium: 141 mEq/L (normal, but was low at week 2 from vomiting)
• Potassium: 4.5 mEq/L (supplement if below 3.5)
• Magnesium: 2.1 mg/dL (supplementing with glycinate)
• Phosphorus: 3.3 mg/dL (normal)

Low electrolytes cause muscle cramps, heart palpitations, and fatigue — symptoms often blamed on the medication itself. Check your levels before assuming it's a drug side effect.