ZMA

ZMA

NOW Sports4.7 (10,156 ratings)
Format:Capsule Quantity: 90 Capsule(s) · 30 servings
Goals

About this product

Filling magnesium and zinc shortfalls is the strongest case for the combination. The selected serving provides 450 mg elemental magnesium, 30 mg zinc and 15 mg vitamin B6, supporting normal muscle and energy functions when intake is low. The combination does not establish higher testosterone, improved training results or extra energy in adequately nourished adults.

Sleep support is possible but uncertain, with magnesium carrying most of that rationale. Zinc has no consistent independent sleep benefit, and B6's role in normal neurotransmitter function does not establish that extra B6 improves sleep. Similar limits apply to broader claims about focus, mood and productivity.

The amounts are substantial enough to warrant a careful fit with the rest of a supplement routine. Magnesium is clearly identified as aspartate, while the ingredient findings describe zinc as an aspartate and L-methionine blend without proportions; other saved product details are less clear about zinc's form. B6 exceeds the adult upper-limit reference supplied in the findings, and no copper amount is available to assess mineral balance.

Who is it for
  • Adults with low magnesium and zinc intake who need both nutrients
  • People considering magnesium-related sleep support with modest expectations
Best for
  • Combined magnesium and zinc intake
  • Support for normal muscle function when nutrient intake is low

Pros

  • Elemental magnesium and zinc amounts are clearly stated
  • Magnesium source is identified as aspartate
  • Focused formula avoids a long list of unrelated actives

Cons

  • Zinc form details differ across the supplied records and blend proportions are unknown
  • Copper amount is unavailable
  • No established additional testosterone or training benefit from the combination
  • Uncertain sleep benefit despite the large nutrient serving

Warnings

  • Vitamin B6 at 15 mg exceeds the supplied 12 mg daily adult upper-limit reference; review regular use before adding other B6 supplements.
  • The serving already supplies 450 mg magnesium and 30 mg zinc; account for other mineral supplements before combining them.

Product analysis

66 out of 100

ZMA may help fill gaps in magnesium, zinc and vitamin B6 that affect normal muscle and immune function. Magnesium may modestly improve sleep in poor sleepers, although the evidence is uncertain.

AI assessment of the formula, label and price. How scoring works

Nutrient Quality59

Vitamin B6 is clearly identified, and magnesium uses a form with reasonably favorable absorption potential. The zinc form is not clearly disclosed on the label, limiting a complete quality comparison.

Ingredient Transparency88

All three amounts are listed, making the serving easy to compare. Vitamin B6 and magnesium forms are named, but the zinc form is not clearly stated.

Value For Money41

Value is mixed, with moderate magnesium value and a relatively high cost for the zinc provided. Vitamin B6 adds only modest value at the full serving cost.

Customer Satisfaction90

Customer ratings are favorable and supported by a very large review count. That gives a broad picture of satisfaction, but it does not establish sleep or hormone benefits.

Product Focus59

The three nutrients mainly help fill nutritional gaps, with uncertain sleep benefits from magnesium. The wide range of intended uses goes beyond what the combination clearly establishes.

Format
Capsule
Container
90 Capsule(s)
Per serving
$0.61
Customer rating
4.7 · 10,156 ratings
Report analysis

Goals

Everyday Health
Impact
Highest effect
A- Ingredient FitA+ PathwaysA- EvidenceA+ Formulation Logic
Magnesium · 450 mgZinc · 30 mg
Study evidence
Magnesium Supportive 114 studies
Zinc Supportive 60 studies
Immunity
Impact
Highest effect
A- Ingredient FitB+ PathwaysA+ EvidenceA+ Formulation Logic
Magnesium · 450 mgZinc · 30 mg
Study evidence
Magnesium Supportive 8 studies
Zinc Supportive 73 studies
Bone Health
Impact
Highest effect
A- Ingredient FitB+ PathwaysA+ EvidenceA+ Formulation Logic
Magnesium · 450 mgZinc · 30 mg
Study evidence
Magnesium Supportive 48 studies
Zinc Supportive 33 studies
Testosterone Support
Impact
Highest effect
A- Ingredient FitB- PathwaysA EvidenceA+ Formulation Logic
Magnesium · 450 mgZinc · 30 mg
Study evidence
Magnesium Disputed 5 studies
Zinc Disputed 7 studies
Impact
Highest effect
A- Ingredient FitB+ PathwaysA+ EvidenceA+ Formulation Logic
Magnesium · 450 mg
Study evidence
Magnesium Supportive 23 studies
Zinc Supportive 14 studies
Energy
Impact
High effect
B+ Ingredient FitF PathwaysA- EvidenceA+ Formulation Logic
Magnesium · 450 mg
Study evidence
Magnesium Supportive 4 studies

Ingredients

IngredientAmount per servingScore
Vitamin B6 (Pyridoxine Hydrochloride)
15 mg 77
Magnesium (Magnesium Aspartate)
450 mg 65
Zinc Mono-L-Methionine Sulfate
30 mg 66
Gluten Free Adults 18–50 Kosher Dairy Free
Report overview
Zinc · 30 mg OverallScore66
B+ Active Ingredient Quality & BioavailabilityC+ Dose, Safety & Label TransparencyF Value
+7
Each serving provides 30 mg of zinc at a high cost per serving. Zinc Aspartate and Zinc L-Methionine are included, but their proportions are unknown. The copper amount is unknown, leaving the zinc-to-copper balance unclear.
How this ingredient is rated

Active Ingredient Quality & Bioavailability84

Zinc Aspartate and Zinc L-Methionine are included, but their proportions are unknown.
Zinc Form Bioavailability
Zinc Aspartate and Zinc L-Methionine are included, but their proportions are unknown.

Dose, Safety & Label Transparency67

Each serving provides 30 mg of zinc. The copper amount is unknown, so the zinc-to-copper balance is unclear.
Elemental Dose Transparency
The label states the elemental zinc amount and source.
Zinc Dosage Safety & Effectiveness
Each serving provides 30 mg of zinc.
Zinc-to-Copper Mineral Balance
The copper amount is unknown, so the zinc-to-copper balance is unclear.

Value30

The cost per serving is high.
Price Per Serving Efficiency
The cost per serving is high.
D Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyD+ Value
+7
Each serving supplies 450 mg of magnesium, a higher amount. The serving cost is moderate for the magnesium source. It uses Magnesium Aspartate.
How this ingredient is rated

Active Ingredient Quality & Bioavailability49

It uses Magnesium Aspartate. No named chelation standard or fully reacted claim is specified.
Magnesium Form & Absorption Potential
It uses Magnesium Aspartate.
Patented Materials & Chelation Quality
No named chelation standard or fully reacted claim is specified.

Dose, Safety & Label Transparency88

The label states the elemental magnesium amount. A supporting ingredient is indicated, but its identity and amount are not specified.
Elemental Yield Transparency
The elemental magnesium amount per serving is stated.
Therapeutic Dosage Alignment
Each serving provides 450 mg of magnesium, a higher amount.
Synergistic Formulation Logic
A supporting ingredient is indicated, but its identity and amount are not specified.

Value50

The serving cost is moderate for the magnesium source.
Price Per Elemental Quality
The serving cost is moderate for the magnesium source.
A+ Ingredient Form & Label QualityC+ Dose, Safety & Label TransparencyD- Value
+2
Each serving provides 15 mg of vitamin B6 at a high cost relative to the B6 amount. The B6 source is Pyridoxine Hydrochloride. The amount is high.
How this ingredient is rated

Ingredient Form & Label Quality100

The B6 source is Pyridoxine Hydrochloride. The ingredient information indicates no artificial colors, titanium dioxide or talc.
Vitamin B6 Form Identification
The B6 source is Pyridoxine Hydrochloride.
Clean Label and Excipient Purity
The ingredient information indicates no artificial colors, titanium dioxide or talc.

Dose, Safety & Label Transparency69

The label states 15 mg of vitamin B6 per serving. This is a high amount.
Vitamin B6 Dose & Safety Policy
The label states 15 mg of vitamin B6 per serving. This is a high amount.
Label Transparency
The amount and chemical source are stated.

Value45

The cost is high relative to the B6 amount.
Vitamin B6 Price Efficiency
The cost is high relative to the B6 amount.
Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Association between Serum Magnesium and Fractures: A Systematic Review and Meta-Analysis of Observational Studies.
    Dominguez LJ; Veronese N; Ciriminna S; Pérez-Albela JL; Vásquez-López VF; Rodas-Regalado S; Di Bella G; Parisi A; Tagliaferri F; Barbagallo M · Nutrients · 2023
    Meta-analysis119,755 participants4 studies pooledBone Health forMagnesium
  2. Bioabsorbable Magnesium-Based Materials Potential and Safety in Bone Surgery: A Systematic Review.
    Hung CH; Kwok YC; Yip J; Wong HH; Leung YY · Craniomaxillofacial trauma & reconstruction · 2025
    Systematic review386 participants8 studies pooledBone Health forMagnesium
  3. Vascularized bone grafting fixed by biodegradable magnesium screw for treating osteonecrosis of the femoral head.
    Zhao D; Huang S; Lu F; Wang B; Yang L; Qin L; Yang K; Li Y; Li W; Wang W; Tian S; Zhang X; Gao W; Wang Z; Zhang Y; Xie X; Wang J; Li J · Biomaterials · 2016
    Randomized trial48 participantsBone Health forMagnesium
  4. An update on magnesium and bone health.
    Rondanelli M; Faliva MA; Tartara A; Gasparri C; Perna S; Infantino V; Riva A; Petrangolini G; Peroni G · Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine · 2022
    Narrative reviewBone Health forMagnesium
  5. Sex-specific differences in the association of magnesium intake with femoral neck bone mineral density among older adults.
    Wang B; Tan X; Yao X; Zhu Z · Endocrine connections · 2025
    Cross-sectional study1,343 participantsBone Health forMagnesium
  6. The Effects of the AGE Inhibitor Pyridoxamine on Bone in Older Women With Type 2 Diabetes: A Randomized Clinical Trial.
    Brossfield AV; McMahon DJ; Fernando J; Omeragic B; Majeed R; Agarwal S; Sroga GE; Wang B; Vashishth D; Rubin MR · The Journal of clinical endocrinology and metabolism · 2025
    Randomized trial55 participantsBone Health forVitamin B6
  7. Dietary B vitamin intake and risk of hip fracture: the Singapore Chinese Health Study.
    Dai Z; Wang R; Ang LW; Yuan JM; Koh WP · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2014
    Cohort study63,257 participantsBone Health forVitamin B6
  8. Hip fracture patients may be vitamin B6 deficient. Controlled study of serum pyridoxal-5'-phosphate.
    Reynolds TM; Marshall PD; Brain AM · Acta orthopaedica Scandinavica · 1993
    Case-control study103 participantsBone Health forVitamin B6
  9. Degree of mineralization-related collagen crosslinking in the femoral neck cancellous bone in cases of hip fracture and controls.
    Saito M; Fujii K; Marumo K · Calcified tissue international · 2006
    Case-control study50 participantsBone Health forVitamin B6
  10. Adequate Intake and Supplementation of B Vitamins, in Particular Folic Acid, can Play a Protective Role in Bone Health.
    Rondanelli M; Tartara A; Fossari F; Vecchio V; Faliva MA; Naso M; Perna S; Nichetti M; Peroni G · Current aging science · 2022
    Narrative review35,298 participants29 studies pooledBone Health forVitamin B6
  11. Increased incidence of fractures in middle-aged and elderly men with low intakes of phosphorus and zinc.
    Elmståhl S; Gullberg B; Janzon L; Johnell O; Elmståhl B · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 1999
    Cohort study6,576 participantsBone Health forZinc
  12. Zinc Supplementation Increases Procollagen Type 1 Amino-Terminal Propeptide in Premenarcheal Girls: A Randomized Controlled Trial.
    Berger PK; Pollock NK; Laing EM; Chertin V; Bernard PJ; Grider A; Shapses SA; Ding KH; Isales CM; Lewis RD · The Journal of nutrition · 2016
    Randomized trial147 participantsBone Health forZinc
  13. Randomized controlled trial of prenatal zinc supplementation and fetal bone growth.
    Merialdi M; Caulfield LE; Zavaleta N; Figueroa A; Costigan KA; Dominici F; Dipietro JA · The American journal of clinical nutrition · 2004
    Randomized trial242 participantsBone Health forZinc
  14. The effects of zinc supplementation on serum zinc, alkaline phosphatase activity and fracture healing of bones.
    Sadighi A; Roshan MM; Moradi A; Ostadrahimi A · Saudi medical journal · 2009
    Randomized trial60 participantsBone Health forZinc
  15. Is Zinc an Important Trace Element on Bone-Related Diseases and Complications? A Meta-analysis and Systematic Review from Serum Level, Dietary Intake, and Supplementation Aspects.
    Ceylan MN; Akdas S; Yazihan N · Biological trace element research · 2021
    Meta-analysis40 studies pooledBone Health forZinc
  16. Circulating and dietary magnesium and risk of cardiovascular disease: a systematic review and meta-analysis of prospective studies.
    Del Gobbo LC; Imamura F; Wu JH; de Oliveira Otto MC; Chiuve SE; Mozaffarian D · The American journal of clinical nutrition · 2013
    Meta-analysis313,041 participants16 studies pooledCardiovascular Support forMagnesium
  17. Magnesium and the risk of cardiovascular events: a meta-analysis of prospective cohort studies.
    Qu X; Jin F; Hao Y; Li H; Tang T; Wang H; Yan W; Dai K · PloS one · 2013
    Meta-analysis532,979 participants19 studies pooledCardiovascular Support forMagnesium
  18. Quantitative Association Between Serum/Dietary Magnesium and Cardiovascular Disease/Coronary Heart Disease Risk: A Dose-Response Meta-analysis of Prospective Cohort Studies.
    Zhao L; Hu M; Yang L; Xu H; Song W; Qian Y; Zhao M · Journal of cardiovascular pharmacology · 2020
    Meta-analysis544,581 participants18 studies pooledCardiovascular Support Heart Health forMagnesium
  19. Comparative Efficacy of Nutraceuticals on Endothelial Function: A Systematic Review and Network Meta-Analysis.
    Norouzzadeh M; Rashedi MH; Mahdavi-Mazdeh G; Kosari A; Shahinfar H · Current atherosclerosis reports · 2026
    Meta-analysisCardiovascular Support Heart Health forMagnesium
  20. Serum magnesium, mortality, and cardiovascular disease in chronic kidney disease and end-stage renal disease patients: a systematic review and meta-analysis.
    Xiong J; He T; Wang M; Nie L; Zhang Y; Wang Y; Huang Y; Feng B; Zhang J; Zhao J · Journal of nephrology · 2020
    Meta-analysis200,934 participants20 studies pooledCardiovascular Support forMagnesium