On a GLP-1 (Ozempic, Wegovy, Zepbound, Mounjaro) you eat less, lose weight fast, and your gut slows down — which raises real nutritional needs: keeping muscle, staying regular, covering nutrient gaps, and staying hydrated. These are the supplements people use for that, ranked by the number the other round-ups skip: cost per dose.
Cost per dose = representative retail price ÷ servings per container. Competitors list a price and a dose but don’t normalize them, so you can’t compare across products. This column does. Prices are representative retail (July 2026) for a common size and vary by brand and retailer — each row links to the live price and our independent monograph. This is general reference, not medical advice.
| # | Supplement | Supports on a GLP-1 | Typical dose | Cost / dose |
|---|---|---|---|---|
| 1 | Vitamin D3 Nutrient gaps | Vitamin D shortfall is common generally and can worsen with low intake; NIH ODS notes vitamin D supports calcium absorption and bone health during weight loss. | Per label (often 1000–2000 IU) | $0.04 250-count bottle, $10.00 |
| 2 | Biotin Hair & skin | Popular for hair during weight loss, but be honest: NIH ODS notes biotin deficiency is rare and evidence that extra biotin helps hair in people who aren't deficient is limited — adequate protein matters more. (Biotin can also skew some lab tests.) | Per label | $0.08 120-count bottle, $9.00 |
| 3 | Vitamin B12 Nutrient gaps | Eating far less can reduce B12 intake; NIH ODS notes B12 is needed for red blood cells and nerve function, and older adults and low-intake diets are common shortfall groups. | Per label (often ~500 mcg) | $0.09 100-count bottle, $9.00 |
| 4 | Calcium Nutrient gaps | Rapid weight loss can stress bone; NIH ODS notes adequate calcium (with vitamin D) supports bone health when dietary intake drops on a GLP-1. | Per label (often 500–600 mg) | $0.10 120-count bottle, $12.00 |
| 5 | Magnesium Citrate Digestive | An osmotic form of magnesium that draws water into the stool; the NIH ODS notes magnesium in forms like citrate is used for constipation relief — relevant to GLP-1-related slowing. | 200–400 mg elemental | $0.12 120-count bottle, $14.00 |
| 6 | Fiber (Psyllium Husk) Digestive | Supports regularity when GLP-1s slow the gut — MedlinePlus notes soluble fiber like psyllium helps soften stool and relieve constipation; increase gradually with fluids. | 5–10 g fiber per serving | $0.14 1 lb tub (~114 servings), $16.00 |
| 7 | Magnesium Glycinate Nutrient gaps | A well-tolerated (less laxative) magnesium form for filling a magnesium gap; NIH ODS notes many adults fall short of magnesium intake targets. | 200–400 mg elemental | $0.15 120-count bottle, $18.00 |
| 8 | Multivitamin Nutrient gaps | A broad insurance policy against gaps when appetite drops on a GLP-1; NIH ODS notes MVMs can help fill shortfalls but aren't a substitute for a balanced diet. | 1 tablet daily | $0.23 60-count bottle, $14.00 |
| 9 | Creatine Monohydrate Muscle | Studied to support strength and lean mass alongside resistance training — the cheapest per-dose muscle-support option, useful for holding onto muscle while losing weight (NIH ODS). | 3–5 g per day | $0.28 500 g tub (~100 servings), $28.00 |
| 10 | Probiotics Digestive | Some people use probiotics for GI comfort while adjusting to a GLP-1; NCCIH notes effects are strain- and condition-specific and evidence is mixed — set expectations accordingly. | 1 capsule daily | $0.83 30-count bottle, $25.00 |
| 11 | Electrolytes Hydration | Supports hydration when you're eating and drinking less on a GLP-1; MedlinePlus notes sodium, potassium and other electrolytes maintain fluid balance. | 1 stick/serving in water | $0.83 30-serving box, $25.00 |
| 12 | Collagen Peptides Muscle | A convenient protein source people add during weight loss; note MedlinePlus flags that evidence for collagen's specific benefits is limited — total protein does the heavy lifting. | 10–20 g per serving | $1.00 1 lb tub (~30 servings), $30.00 |
| 13 | Whey Protein Muscle | Helps meet higher protein needs to preserve muscle during GLP-1 weight loss — per NIH ODS, adequate protein supports building, maintaining, and repairing muscle (resistance exercise matters most). | 20–25 g per serving | $1.45 2 lb tub (~31 servings), $45.00 |
| 14 | Casein Protein Muscle | A slow-digesting milk protein that helps meet daily protein targets to preserve muscle during weight loss (NIH ODS notes total protein intake is what matters). | 20–25 g per serving | $1.79 2 lb tub (~28 servings), $50.00 |
| 15 | Plant Protein Muscle | A dairy-free way to reach protein targets for muscle maintenance during GLP-1 weight loss — useful if whey/casein cause GI upset (NIH ODS). | 20–25 g per serving | $1.96 2 lb tub (~23 servings), $45.00 |
The cost / dose column is unique to pharmaranks — the price-and-dose tables elsewhere leave you to do this math. Tap a supplement for its independent monograph (benefits, dosage, safety) and to check the live price.
The biggest levers on a GLP-1 aren’t supplements at all — they’re getting enough protein, doing resistance exercise to hold onto muscle, drinking fluids, and adding fiber for regularity. Supplements fill gaps; they don’t make the medicine work better. Cheapest per dose here (creatine, psyllium fiber, B12, vitamin D) is not the same as most important for you — that depends on your diet, labs and health. Always tell your GLP-1 prescriber what you’re taking.
The “supports” notes summarize these public health authorities in our own words.
General reference, not medical advice, and not a substitute for your doctor or pharmacist. Supplement evidence varies and is often limited; these statements have not been evaluated by the FDA, and supplements are not intended to diagnose, treat, cure, or prevent any disease. If you take a GLP-1 or any medication, confirm with a licensed professional before starting a supplement. Prices are representative and change; check the live price before buying.