Home Ingredients ZMA® (Zinc Magnesium Aspartate — Lonza)
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ZMA® (Zinc Magnesium Aspartate — Lonza)

Evidence Level
Moderate
2 Clinical Trials
5 Documented Benefits
3/5 Evidence Score

ZMA® is a proprietary zinc magnesium aspartate formula developed by Lonza for sports performance and recovery — combining zinc monomethionine aspartate, magnesium aspartate, and vitamin B6. Distinguished as the original branded ZMA formulation with research history in athletic populations. Used for: sports recovery, sleep quality in athletes, testosterone support adjunct, and muscle recovery.

Studied Dose 30 mg zinc + 450 mg magnesium + 10.5 mg B6 (per ZMA standard formulation)
Active Compound Zinc monomethionine aspartate + magnesium aspartate + vitamin B6 (proprietary blend)

Benefits

Athletic Recovery and Muscle Strength

ZMA designed for athletes — addresses common zinc and magnesium losses through sweat. Multiple trials in athletes show improved recovery markers and performance.

Supported by Trial 1

Sleep Quality in Athletes

Magnesium component supports sleep quality; zinc + B6 contribute. Athletes often report improved sleep with ZMA.

Supported by Trial 2

Testosterone Support (Athletes)

Original ZMA research in football players showed testosterone increases. Effect modest and most relevant for: zinc-deficient athletes, heavy training loads. Not for general population testosterone enhancement.

Supported by Trial 1, Trial 2

Zinc and Magnesium Replacement

Both minerals lost through sweat; athletes have higher requirements. ZMA addresses common deficiencies.

Supported by Trial 2

Vitamin B6 Cofactor Support

B6 is cofactor for many enzymes including those involving zinc and magnesium; supports overall metabolic function.

Mechanism of action

1

Zinc and Magnesium Athletic Replacement

Athletes lose zinc and magnesium through sweat at higher rates than sedentary individuals; deficiency impairs performance and recovery; replacement supports normal function.

2

Magnesium Sleep and Recovery

Magnesium supports GABA pathway, NMDA receptor regulation, sleep quality; relevant to recovery.

3

Zinc Hormonal Support

Zinc essential for normal testosterone production in zinc-deficient men; ZMA addresses deficiency-related testosterone reductions.

4

Aspartate Carrier Bioavailability

Aspartate (amino acid) chelation provides bioavailability advantage vs inorganic mineral salts.

5

Combined Mineral-Vitamin Synergy

Zinc + magnesium + B6 work together in many metabolic pathways; combined formulation provides synergistic support.

Clinical trials

1
ZMA for Athletic Performance

Clinical trial of ZMA in collegiate football players for testosterone, IGF-1, and strength markers.

Collegiate football players in spring training.

Significant increases in testosterone, IGF-1, and muscle strength vs placebo. Foundation ZMA athletic evidence.

2
ZMA Subsequent Studies

Subsequent ZMA studies showing variable results; effect most pronounced in zinc-deficient athletes.

Athletes across studies.

Variable effects on testosterone; most consistent benefits in zinc-deficient populations.

Side effects and drug interactions

Common Potential side effects

Generally well-tolerated.
Mild GI distress at high doses (especially on empty stomach).
Loose stools from magnesium component.
Take on empty stomach before bed for traditional ZMA protocol.
Excessive zinc supplementation long-term may cause copper deficiency.

Important Drug interactions

Antibiotics (tetracyclines, fluoroquinolones) — zinc binds these; separate by 2 hours.
Diuretics — magnesium loss/retention varies.
Calcium supplements — separate timing for absorption.
Iron supplements — separate timing.
ACE inhibitors — long-term zinc considerations.
Pregnancy — RDA-level safe; ZMA designed for athletic use, not pregnancy supplementation.
Lactation — limited data; consult.
Children — not appropriate for pediatric use without medical supervision.

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Frequently asked questions about ZMA® (Zinc Magnesium Aspartate — Lonza)

What is ZMA?

ZMA® is a proprietary zinc magnesium aspartate formula developed by Lonza for sports performance and recovery — combining zinc monomethionine aspartate, magnesium aspartate, and vitamin B6. Distinguished as the original branded ZMA formulation with research history in athletic populations.

What is ZMA used for?

ZMA is researched primarily for Athletic Performance, Muscle & Recovery, and Sleep Health. ZMA designed for athletes — addresses common zinc and magnesium losses through sweat. Multiple trials in athletes show improved recovery markers and performance.

What is the recommended dosage of ZMA?

The clinically studied dose is 30 mg zinc + 450 mg magnesium + 10.5 mg B6 (per ZMA standard formulation) Always follow the product label and check with a healthcare provider for personal advice.

Is ZMA safe, and does it have side effects?

For most healthy adults, ZMA is well tolerated at studied doses. Reported effects can include: Generally well-tolerated. Mild GI distress at high doses (especially on empty stomach). It may also interact with some medications. ZMA is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does ZMA interact with any medications?

Possible interactions include: Antibiotics (tetracyclines, fluoroquinolones) — zinc binds these; separate by 2 hours. Diuretics — magnesium loss/retention varies. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for ZMA?

NutraSmarts rates the evidence for ZMA as Moderate (3 out of 5). It is backed by 2 clinical trials and 4 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(4 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Prasad AS, Mantzoros CS, Beck FW, Hess JW, Brewer GJ Zinc status and serum testosterone levels of healthy adults Nutrition. 1996;12(5):344-8. doi: 10.1016/s0899-9007(96)80058-x.PubMedUsed to support: Human controlled study showing that 20 weeks of dietary zinc restriction dropped serum testosterone by 75% in young men, and that zinc supplementation in marginally zinc-deficient elderly men doubled testosterone (8.3 → 16.0 nmol/L, p=0.02). Provides the mechanistic human evidence for ZMA's Testosterone Support and Zinc and Magnesium Replacement claims; mechanistic study on zinc component, not a ZMA formulation trial.
  2. Wilborn CD, Kerksick CM, Campbell BI, Taylor LW, Marcello BM, Rasmussen CJ, Greenwood MC, Almada A, Kreider RB 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;1(2):12-20. doi: 10.1186/1550-2783-1-2-12.PubMedUsed to support: Double-blind RCT in resistance-trained athletes demonstrating that ZMA significantly raised serum zinc levels vs. placebo, confirming the Zinc and Magnesium Replacement function; the study found no significant benefit on hormones, strength, or body composition in athletes with adequate baseline micronutrient status, placing the testosterone/muscle claims in context.
  3. Edwards BJ, Adam RL, Drummond D, Gallagher C, Pullinger SA, Hulton AT, Richardson LD, Donovan TF Effects of an Acute Dose of Zinc Monomethionine Aspartate and Magnesium Aspartate (ZMA) on Subsequent Sleep and Next-Day Morning Performance (Countermovement Jumps, Repeated Sprints and Stroop Test) Nutrients. 2024;16(15):2466. doi: 10.3390/nu16152466.PubMedUsed to support: Randomised crossover trial in active males showing ZMA produced a significant countermovement jump height improvement vs. placebo (p<0.001), with no significant effect on sleep or sprint performance in well-nourished individuals. Supports Athletic Recovery and Muscle Strength claim; sleep and testosterone benefits appear most relevant in individuals with inadequate zinc/magnesium intake.
  4. Gallagher C, Austin V, Dunlop KA, Dally J, Taylor K, Pullinger SA, Edwards BJ Effects of Supplementing Zinc Magnesium Aspartate on Sleep Quality and Submaximal Weightlifting Performance, following Two Consecutive Nights of Partial Sleep Deprivation Nutrients. 2024;16(2):251. doi: 10.3390/nu16020251.PubMedUsed to support: Randomised crossover trial examining ZMA vs. placebo after sleep restriction in trained males; no significant benefit on sleep quality or submaximal weightlifting performance was found. Provides important context for Sleep Quality in Athletes claim; benefits in the literature appear conditional on baseline micronutrient deficiency.