Not for healthy lifters who already eat enough zinc and magnesium. Three 2024 trials from one UK lab gave trained men the standard ZMA dose (30 mg zinc, 450 mg magnesium, 10.5 mg vitamin B6) before bed, and none found better sleep; in the largest, 69 men slept about half an hour less on ZMA. An earlier 8-week trial in 42 trained men found no gain in strength, body composition or hormones.
ZMA has sat in gym bags since at least 2000, when its first study came out, and people still search “zma sleep and recovery”. So here is what the trials actually measured, what is in a standard serving against NIH’s limits, and who might still get something from it.
The Short Version
- Sleep: across three 2024 trials in trained men, ZMA did not improve sleep, and in 69 men it cut total sleep by about 0.46 hours (Behavioral Sciences, 2024).
- Strength and hormones: 8 weeks of a commercial ZMA supplement in 42 resistance-trained men changed nothing in strength, body composition or testosterone (Journal of the International Society of Sports Nutrition, 2004).
- The dose problem: a standard serving’s 450 mg of magnesium sits 100 mg above NIH’s 350 mg upper limit for magnesium from supplements.
- Ninja Immortal holds all three ZMA nutrients in one scoop at label doses under those limits: 18 mg of zinc, 126 mg of magnesium and 1 mg of vitamin B6.
What Is ZMA, and What’s Actually in It?
ZMA is zinc (as monomethionine and aspartate), magnesium aspartate and vitamin B6, sold as a capsule to take 30 to 60 minutes before bed on an empty stomach. The standard serving used in the recent trials is 30 mg of zinc, 450 mg of magnesium and 10.5 mg of vitamin B6. Here is how that lines up with what NIH says adults need, and the most they should take.
| Nutrient | Standard ZMA serving | Adult daily need (NIH) | Upper limit (NIH) |
|---|---|---|---|
| Zinc | 30 mg | 8 to 12 mg | 40 mg a day |
| Magnesium | 450 mg | 310 to 420 mg | 350 mg a day from supplements |
| Vitamin B6 | 10.5 mg | 1.3 to 1.7 mg | 100 mg a day (Europe’s food safety agency set 12 mg in 2023) |
Read that magnesium row twice. A standard serving is 100 mg over the supplement limit before you count anything else. And 30 mg of zinc on top of food (11.9 to 23.2 mg a day in one ZMA trial’s volunteers) lands at or past the 40 mg ceiling.
Does ZMA Help You Sleep?
Not in the trials that tested it in trained men. A lab at Liverpool John Moores University ran three placebo-controlled studies in 2024, each comparing ZMA with a placebo and with no pill at all:
- Short sleep, then the barbell. 16 trained men slept 4 hours for two nights on ZMA, placebo or nothing. ZMA had no effect on their sleep or on bench press and squat power the next morning.
- Normal sleep, then jumps and sprints. 19 recreationally trained men whose diets already covered zinc, magnesium and B6 took ZMA for two nights. No effect on sleep, sprints or a thinking test; jump height beat the placebo night but not the no-pill night.
- The biggest one. 69 men, split into 4-hour and 8-hour sleep groups. ZMA cut total sleep by about 0.46 hours overall, and by about 0.94 hours in the men allowed a full 8.
The fair limits: these were two-night studies in men who already ate enough of the three nutrients, so they cannot speak for someone who is actually short. Zinc on its own has a thin but positive record: a 2024 systematic review of 8 trials found most pointed to better sleep quality in adults, with no consensus. Magnesium alone is its own story, told in Does Magnesium Help You Sleep?
ZMA is the old Vice City nightclub flyer: a famous name, big promises, and when you finally walk in, the dance floor is empty.
Does ZMA Boost Testosterone?
Not if you already eat enough zinc. The claim traces to a 2000 study by Brilla and Conte in football players that reported higher testosterone, IGF-1 and strength. Later trials did not repeat it: 8 weeks of a commercial ZMA supplement in 42 resistance-trained men (2004, funded by the supplement’s maker) changed no anabolic or catabolic hormone, and a 2009 trial in 14 men eating 11.9 to 23.2 mg of zinc a day found no change in total or free testosterone.
Zinc does matter when you are short of it. In a 1996 study, cutting dietary zinc in 4 young men for 20 weeks dropped their testosterone from 39.9 to 10.6 nmol/L, and six months of zinc in 9 older men who were marginally low raised it from 8.3 to 16.0. Fix a shortfall and the number can recover; pile on more and it does not climb past normal.
Does ZMA Help Muscle Recovery and Strength?
The trials say no. In the 8-week study, the ZMA group matched the placebo group on bench press and leg press one-rep max, muscular endurance, sprint-cycling capacity and body composition. In the 2024 short-sleep study, ZMA did nothing for next-morning lifting power at 40, 60 or 80% of one-rep max. The single bright spot, jump height, beat a placebo but not a night with no pill, which makes it hard to credit to ZMA.
Recovery still runs on the basics: enough sleep, enough protein and enough of every mineral. For the sleep side of that, see Which Sleep Supplements Help Muscle Recovery?
Who Might Actually Benefit From ZMA?
Someone who is genuinely short on zinc or magnesium, and the label dose is a blunt way to fix that. NIH says most Americans get enough zinc, while many eat less magnesium than recommended. The groups NIH lists at higher risk of low zinc include vegetarians and vegans, and older adults are more likely to run marginal.
If that is you, the evidence points to covering the shortfall at daily-need doses from food first, then a supplement that stays under the limits, rather than a megadose at bedtime. And if your sleep is the problem, the trials above say ZMA is the wrong tool.
Coach’s Corner: The Recovery Day Circuit
- Easy walk: 1 x 10 minutes, nose breathing if you can. Easy enough to hold a conversation.
- World’s greatest stretch: 2 x 5 a side, 30 seconds rest. Back knee off the floor, rotate through your upper back, not your lower back.
- 90/90 hip switches: 2 x 8 a side, 30 seconds rest. Sit tall and let the knees fall side to side slowly.
- Glute bridge: 2 x 12, 45 seconds rest. Pause one second at the top and keep your ribs down.
- Dead hang from a bar: 2 x 20 to 30 seconds, 60 seconds rest. Grip firm, shoulders active, not shrugged into your ears.
Healthy adults: if you have an injury, pain, a heart condition, or you are new to training, check with your doctor before you start. Stop if it hurts.
The Fuel Plan
| Zinc | Magnesium | Vitamin B6 | |
|---|---|---|---|
| Adult daily need (NIH) | 8 to 12 mg | 310 to 420 mg | 1.3 to 1.7 mg |
| Upper limit (NIH) | 40 mg | 350 mg from supplements | 100 mg |
| Food first (NIH) | Meat, seafood (oysters above all), eggs, dairy | Leafy greens, legumes, nuts, seeds, whole grains | Fish, organ meats, potatoes, non-citrus fruit |
| Standard ZMA serving | 30 mg | 450 mg | 10.5 mg |
| One scoop of Ninja Immortal (label) | 18 mg | 126 mg | 1 mg |
| Timing note (NIH) | 25 mg or more of iron taken at the same time can reduce zinc absorption | ||
These are general numbers for healthy adults. With kidney disease, diabetes or any medical diet, ask your doctor or a registered dietitian.
Where Ninja Immortal Fits
If you like the idea behind ZMA, zinc, magnesium and B6 covered every day, Ninja Immortal puts all three in one scoop of our daily multivitamin and collagen drink, at label doses that stay under NIH’s limits: 18 mg of zinc, 126 mg of magnesium as bisglycinate and 1 mg of vitamin B6, alongside 5000 mg of bovine collagen peptides a scoop. That is not a ZMA megadose, and after the 2024 trials, that is no loss. You get the nutrients the flyer was about, inside a daily foundation, without a 450 mg magnesium hit at bedtime.
Who it’s for: lifters who want zinc, magnesium and B6 covered every day alongside a multivitamin and collagen. Who it’s not for: anyone shopping for a testosterone booster or a sleep aid (for nights, that is Ninja Zen), and anyone expecting a quick fix for sore joints, because the joint research is mixed.
Ninja Immortal: The Doses This Article Is About
Per serving, straight from the label. The full label is on the product page.
| Zinc (as Zinc Citrate) | 18mg |
| Magnesium (as Magnesium Bisglycinate Chelate) | 126mg |
| Vitamin B6 (as Pyrodoxine HCI) | 1mg |
The numbers: $49.99 for 30 scoops is $1.67 a day, or $1.42 with Subscribe and Save (15% off). All three flavours are in stock: Berry Blast, Citrus Splash and Mango Crush.
The product people most often buy with Ninja Immortal is Ninja Guardian, our daily greens and reds.
Great product- tastes good and a great source of vitamins
Instead of taking ur vitamins and pills form, this ninja immortal is the way to go! Properly dosed 👌with an amazing taste. 10/10!!!!
This tastes amazing. Best way to take your vitamins.
If you take prescription medication, check with your doctor first. Count every supplement that contains zinc or magnesium against the limits in the table above.
Frequently Asked Questions
What are the ingredients in ZMA?
ZMA is zinc (as monomethionine and aspartate), magnesium aspartate and vitamin B6. The standard serving used in recent trials is 30 mg of zinc, 450 mg of magnesium and 10.5 mg of vitamin B6, usually taken 30 to 60 minutes before bed on an empty stomach.
What are the benefits of taking magnesium and zinc together?
Both are essential minerals, and covering a shortfall in either is worth doing. In trials of trained men who already ate enough of both, though, ZMA did not improve sleep, strength or testosterone. The benefit is filling a gap, not going past normal.
What is the difference between ZMA and regular zinc and magnesium supplements?
ZMA is a fixed bedtime combination at high doses: its 450 mg of magnesium is above NIH’s 350 mg upper limit for supplements, and its 30 mg of zinc sits close to the 40 mg limit. A regular supplement or multivitamin can deliver amounts closer to daily need, such as the 18 mg of zinc and 126 mg of magnesium in a scoop of Ninja Immortal.
What is the best time to take ZMA?
The label instructions used in the trials were 30 to 60 minutes before bed on an empty stomach. Note that in the largest 2024 trial, ZMA at bedtime shortened total sleep by about half an hour compared with placebo or no pill.
Is it safe to take ZMA every day?
Check the dose against NIH’s limits first. A standard serving’s 450 mg of magnesium is above the 350 mg supplement limit, which raises the chance of diarrhea, nausea and cramping, and NIH notes that 50 mg of zinc or more a day for weeks can inhibit copper absorption. If you take prescription medication, ask your doctor first.
Next read: Does Sleep Affect Muscle Growth? And for zinc, magnesium and B6 every day without the megadose, Ninja Immortal has all three in one scoop.
Sources
- Edwards BJ, et al. In Males with Adequate Dietary Needs Who Present No Sleep Disturbances, Is an Acute Intake of Zinc Magnesium Aspartate, Following Either Two Consecutive Nights of 8 or 4 h of Sleep Deprivation, Beneficial for Sleep and Morning Stroop Interference Performance? Behavioral Sciences, 2024.
- Gallagher C, et al. Effects of Supplementing Zinc Magnesium Aspartate on Sleep Quality and Submaximal Weightlifting Performance, following Two Consecutive Nights of Partial Sleep Deprivation. Nutrients, 2024.
- Edwards BJ, et al. Effects of an Acute Dose of Zinc Monomethionine Asparate and Magnesium Asparate (ZMA) on Subsequent Sleep and Next-Day Morning Performance (Countermovement Jumps, Repeated Sprints and Stroop Test). Nutrients, 2024.
- Wilborn CD, et al. Effects of Zinc Magnesium Aspartate (ZMA) Supplementation on Training Adaptations and Markers of Anabolism and Catabolism. Journal of the International Society of Sports Nutrition, 2004 (funded by the supplement’s maker).
- Koehler K, et al. Serum testosterone and urinary excretion of steroid hormone metabolites after administration of a high-dose zinc supplement. European Journal of Clinical Nutrition, 2009.
- Prasad AS, et al. Zinc status and serum testosterone levels of healthy adults. Nutrition, 1996.
- Jazinaki MS, et al. Effects of zinc supplementation on sleep quality in humans: A systematic review of randomized controlled trials. Health Science Reports, 2024.
- NIH Office of Dietary Supplements. Fact Sheets for Health Professionals: Zinc; Magnesium; Vitamin B6. ods.od.nih.gov, read 25 October 2026.
How we wrote this: we rewrote this page because Google shows it for “zma sleep and recovery” and lifters keep asking whether ZMA works. We read the trials and review above, the full texts for the doses each trial used, and NIH’s fact sheets for zinc, magnesium and vitamin B6, checked every Ninja Immortal amount against its label, and took every price from the store on 25 October 2026. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
