🟢 100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 100% of ingredients have research evidence
A Label Compliance Grade

Product Label

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Label Data

2 Capsule(s) Serving Size
40 Servings
Other Combinations Product Type
100% Evidence Coverage

Supplement Facts — Evidence Check

30 mg (200% DV)
✅ 2.7× RDA — within safe limits 📚 258 studies (Tier A: 6, B: 134)
RDA 11mg This product: 30mg UL 40mg
450 mg (113% DV)
📊 Market median: 4002.0mg (1 products) 📚 20 studies (Tier A: 0, B: 2)
This product: 450mg
10.5 mg (525% DV)
📊 8.1× RDA — above typical dose (UL: 100 mg) 📚 113 studies (Tier A: 3, B: 35)
RDA 1.3mg This product: 10.5mg UL 100mg

Other Ingredients

Gelatin

Label Claims — Verification

Nutrient
All Other
Structure/Function
All Other (99% of products) Structure/Function (84% of products) Nutrient (48% of products)

Target Groups

Adult (18 - 50 Years) Gluten Free

Product Information

📋 Directions for Use

For best results: Combine with Nutrakey's melatonin to enhance deep, restful sleep, and improve natural sleep cycles.

Recommended Use: Men take 3, women take 2 capsules daily, preferably on an empty stomach 30-60 minutes before bedtime. For best results, avoid taking within 1 hour of consuming dairy or other calcium containing foods or supplements.

⚠️ Warnings & Precautions

Warning: Pregnant or lactating women, diabetics, hypoglycemics, and people with known medical conditions and/or taking drugs should consult with a licensed physician and/or pharmacist prior to taking dietary supplements.

Do not use if seal is broken.

Do not use if packaging has been tampered with.

🧪 Formulation Notes

450 mg magnesium

Recovery and restful deep sleep Restorative mineral support Z Optima's formula has been shown to increase muscle strength and boost anabolic response when used in conjunction with weight training in athletes with common nutritional deficiencies. Improve sleep quality The ingredients in Z Optima have been shown to support natural deep sleep cycles, with less waking episodes. Improved sleep quality further supports maximizing: Recovery Growth Regeneration

Recovery aid Restorative mineral support Enhance recovery Promote sleep Restful sleep Support recovery Stimulate growth

Non GMO Gluten free Dye free Paraben free

Additional Information

Follow for free giveaways

Store in a cool, dry place.

Packaging is BPA (Bisphenol A) free.

BPA free

Product Details

UPC / SKU 8 51090 00607 2
DSLD Entry Date 2023-06-22
Product Type Other Combinations
Form Capsule
Brand NutraKey
DSLD ID 287426
Data Updated 2026-04-11

Research Evidence

397 Research Sources
55 Avg Quality Score
200 Meta Analysis
68 Rct
58 Systematic Review
53 Clinical Trial
9 Cochrane Review
2 Narrative Review
2 Regulatory Source
1 Observational
1 Other
1 Openfda Safety
A Zinc supplementation for improving pregnancy and infant outcome
Meta Analysis The Cochrane database of systematic reviews 2021
A Zinc supplementation for preventing mortality, morbidity, and growth failure in children aged 6 months to 12 years
Narrative Review The Cochrane database of systematic reviews 2023
A Oral zinc for treating diarrhoea in children
Meta Analysis The Cochrane database of systematic reviews 2016
A Zinc supplements for preventing otitis media
Meta Analysis The Cochrane database of systematic reviews 2014
A Zinc for the prevention or treatment of acute viral respiratory tract infections in adults: a rapid systematic review and meta-analysis of randomised controlled trials
Meta Analysis BMJ open 2021
A Zinc supplements for preventing otitis media
Meta Analysis The Cochrane database of systematic reviews 2010
A Zinc supplements for preventing otitis media
Meta Analysis The Cochrane database of systematic reviews 2012
A Compression bandages or stockings versus no compression for treating venous leg ulcers
Meta Analysis The Cochrane database of systematic reviews 2021
A Zinc supplementation for mental and motor development in children
Meta Analysis The Cochrane database of systematic reviews 2012
A Zinc for the common cold
Meta Analysis The Cochrane database of systematic reviews 2013
View all evidence for Zinc →

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