Supplements on GLP-1 Drugs
GLP-1 medications (semaglutide, tirzepatide) work by cutting appetite — which means much less food, faster muscle loss, and easy nutrient gaps. The supplement job here isn’t weight loss (the drug does that); it’s protecting muscle, covering the gaps, and managing the GI side effects. Here’s what the evidence supports, minus the protein-brand marketing.
Last reviewed Jun 24, 2026 · Evidence-based — every ingredient links to its underlying studies.
Work with your prescriber
These support the medication; they don’t replace medical guidance. Tell your prescriber what you’re taking, and prioritise protein + resistance training over any pill — that’s the part with the strongest evidence for keeping muscle. Note the medication itself can cause low blood sugar when combined with insulin or sulfonylureas, and rare but serious effects (pancreatitis, dehydration/kidney injury from severe vomiting) — those are issues for your prescriber, not supplement ones.
- Hit a protein target (~1.2–1.6 g/kg/day)
- Resistance-train to protect muscle
- Use fiber + electrolytes for GI side effects
- Cover micronutrient gaps from eating less
- Expect supplements to drive the weight loss
- Megadose anything
- Fall for "GLP-1 booster" / "fat burner" products
Key point: On a GLP-1, the mission is muscle preservation and nutrient coverage — not more weight loss.
What actually helps
- 9Protein (whey or plant)— Easiest way to hit protein targets when appetite is low
- 9.5Creatine— 3–5 g/day supports strength + lean mass alongside training
- 6HMB— May help limit muscle breakdown during rapid weight loss; modest evidence
- 7.5Vitamin D— Supports muscle function; common deficiency
- 8.5Psyllium / fiber— For constipation; start low with plenty of water, take separately from other oral meds, and stop/call your prescriber for severe or persistent abdominal pain or vomiting
- 8.5Magnesium— Magnesium citrate can help constipation
- 7Ginger— Modest help for nausea
- 9Probiotics— May help overall GI tolerance; strain-dependent
- 7Electrolytes— Useful if intake/hydration drops sharply
- 6Multivitamin— Reasonable insurance when total intake is low
- 7.5Vitamin B12— Worth monitoring on long-term reduced intake
- 9Omega-3— If fish intake drops
- 9Iron— Only if bloodwork shows you’re low
Why muscle preservation matters most
Rapid weight loss from any cause takes some muscle with the fat, and GLP-1 trials suggest a meaningful share of the loss can be lean mass. Losing muscle lowers your metabolic rate and strength and makes weight regain easier. The fix is mostly behavioural — enough protein and resistance training — with creatine and possibly HMB as supporting players. No supplement substitutes for those two basics.
Sources & further reading
Common questions
Do I need supplements on Ozempic/Wegovy?
Not strictly, but protein + resistance training to protect muscle, and fiber/electrolytes for side effects, are the highest-value additions. A multivitamin is reasonable insurance when you’re eating much less.
How much protein should I aim for?
Roughly 1.2–1.6 g per kg of body weight per day is a common target for preserving muscle during weight loss — easier to hit with a protein supplement when appetite is suppressed.
Will creatine make me regain weight?
Creatine adds a small amount of water in muscle, not fat. It supports the strength and lean mass you’re trying to keep — it doesn’t undermine fat loss.
Does berberine work like a GLP-1?
No. Berberine helps blood sugar and is far weaker than GLP-1 drugs — the "nature’s Ozempic" framing is marketing. See our berberine guide for the detail.
What about "GLP-1 booster" supplements?
There’s no supplement that meaningfully replicates the medication. Treat "booster" and "natural GLP-1" products as marketing.
Educational guidance, not medical advice. Evidence and safety details for each option live on its individual page; see a clinician for prescription treatments or persistent problems.
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