If you are lifting through this, you are already doing the thing that matters most. The supplements are there to keep you doing it.
Adjust what you are measuring
The most useful change is not a supplement. It is what you consider a good outcome.
In a deficit of this size, maintaining your working weights is a genuine success. Adding to them is a bonus, and most likely if you are relatively new to lifting. Expecting linear progression while losing 20% of your body weight will make you feel like you are failing at something you are actually doing well.
Ranked · supplements for training on a GLP-1
How this was ordered: Evidence for maintaining training quality and lean mass during an energy deficit, rather than for building muscle in a surplus, which is not the situation you are in. Cost and whether the format survives a suppressed appetite decide close calls.
| # | Product | Key spec | Price | Best for |
|---|---|---|---|---|
| 1 | GLP-1 FoundationMinome | 5,000 mg creatine + 1,000 mg sodium electrolytes | $39.99/mo sub | The two things that limit training here |
| 2 | Gold Standard 100% WheyOptimum Nutrition | 24 g protein per scoop | ~$1.10/serving (~$33/mo) | Hitting a target the drug makes impossible |
| 3 | CreatineThorne | 5,000 mg monohydrate · NSF Certified for Sport | ~$0.50/serving (~$15/mo) | Tested athletes and tight budgets |
| 4 | Caffeine (tablets or coffee)Generic | 100–200 mg pre-training | ~$5 for months | Sessions you would otherwise skip |
| 5 | Creatine HMBTransparent Labs | 5,000 mg creatine + 1,500 mg HMB | ~$0.83/serving (~$25/mo) | Those persuaded by the HMB case |
1. GLP-1 Foundation
The two reasons people train badly on a GLP-1 are depleted phosphocreatine and dehydration, and this addresses both in one drink. Creatine is the most reliably effective training supplement in existence, and the sodium load matters more than lifters expect when food intake has halved.
Against it No NSF or Informed Sport certification, which rules it out if you compete in a tested sport. Three times the cost of plain creatine if you are already hydrating well.
2. Gold Standard 100% Whey
Training in a deficit without adequate protein is how you convert a weight loss into a strength loss. Liquid protein is the only realistic way most people on these drugs reach 1.2 to 1.6 g/kg.
Against it Competes with the appetite you were saving for real food. On heavy training days that trade is worth it; on bad nausea days it is not.
3. Creatine
Identical active to the top pick, independently certified, at a third of the price. If you are drug-tested this moves to first place automatically.
Against it No electrolytes, so most GLP-1 users will end up buying hydration separately and spending more overall.
4. Caffeine (tablets or coffee)
The best-evidenced ergogenic aid there is, and on a low-energy-availability day the difference between training and not training. Cheaper than any pre-workout and without the proprietary blend.
Against it Suppresses appetite further, which is the last thing you need, and worsens sleep if taken late. Both matter more here than in a normal training context.
5. Creatine HMB
HMB's anti-catabolic rationale is at its most plausible in exactly this scenario — trained person, meaningful energy deficit — and the dose is real.
Against it The human evidence remains inconsistent and far weaker than creatine's. You are paying a premium for the least certain ingredient in the tub.
Prices checked September 2026 and change often. No link on this page is an affiliate link, and no brand listed has paid for, reviewed, or been shown this ranking before publication.
Training on low energy availability
Some days you will arrive at the gym with very little in the tank, because you ate 900 calories the day before without noticing.
On those days, reduce volume and protect intensity. Fewer sets at a similar load preserves the signal that tells your body to keep the muscle; endless light sets in a deficit mostly buys fatigue.
The drug decides how much weight you lose. What you do in the gym decides how much of it you were sorry to lose.
Eating around training
The hard part is not what to take. It is getting anything in before a session when the drug has removed your interest in food.
A liquid carbohydrate and protein source an hour beforehand is usually more tolerable than solid food, and on a suppressed appetite it may be the only thing you can face. If pre-training food is impossible, train anyway and prioritise protein afterwards — the post-session window is far more forgiving than the internet suggests, and total daily protein matters more than its timing.
The one exception is if you take insulin or a sulfonylurea, where training fasted carries a genuine hypoglycaemia risk worth planning around rather than improvising.