Zinc Citrate 50 mg by 21st Century — Ingredients, Evidence & Safety

Product Label

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Safety Alerts

⚠️ Zinc: 50mg is 1.2× the Tolerable Upper Intake Level (40mg)

Label Data

1 Tablet(s) Serving Size

60 Servings

Mineral Product Type

50% Evidence Coverage

Supplement Facts — Evidence Check

Calcium

46 mg (4% DV)

Zinc

50 mg (455% DV)

⚠️ Exceeds Tolerable Upper Intake Level by 1.2× (UL: 40 mg) 📚 258 studies (Tier A: 6, B: 134)

RDA 11mg This product: 50mg UL 40mg

Other Ingredients

Cellulose Stearic Acid Hydroxypropyl Methylcellulose Croscarmellose Sodium Contains <2% of

Label Claims — Verification

❓ Nutrient

❓ All Other

❓ Structure/Function

All Other (99% of products) Structure/Function (83% of products) Nutrient (61% of products) Approved Health (4% of products)

Target Groups

Vegan Vegetarian Adult (18 - 50 Years) Gluten Free

Product Information

📋 Directions for Use

Directions: As a mineral supplement, adults take one (1) tablet daily with any meal or as directed by a healthcare provider. Do not exceed recommended dosage.

⚠️ Warnings & Precautions

Do not exceed recommended dosage.

Warning: Consult a healthcare provider prior to use if pregnant, nursing, on medications, have a medical condition or are planning a medical procedure.

Stop use and contact a physician if adverse reactions occur.

Keep out of reach of children.

Do not use if product appears to be tampered with or seal is broken.

🧪 Formulation Notes

Zinc is an important antioxidant mineral that supports the immune system.

No added sugar, yeast, preservatives or artificial flavors.

Suitable for vegans.

Antioxidant & immune support

Gluten free Non-GMO

Guaranteed quality Laboratory tested

Additional Information

Individual results may vary.

Store at room temperature.

Trusted quality for over 30 years

Product Details

UPC / SKU 7 40985 28026 3

DSLD Entry Date 2022-01-22

Product Type Mineral

Form Tablet or Pill

Brand 21st Century

DSLD ID 258624

Data Updated 2026-04-11

Research Evidence

11 Research Sources

52 Avg Quality Score

7 Rct

4 Meta Analysis

B Citrate salts for preventing and treating calcium containing kidney stones in adults

Meta Analysis The Cochrane database of systematic reviews 2015

PubMed DOI

B Effect of potassium citrate on bone density, microarchitecture, and fracture risk in healthy older adults without osteoporosis: a randomized controlled trial

Rct The Journal of clinical endocrinology and metabolism 2013

PubMed DOI

B Regional Citrate Anticoagulation or Heparin Anticoagulation for Renal Replacement Therapy in Patients With Liver Failure: A Systematic Review and Meta-Analysis

Meta Analysis Clinical and applied thrombosis/hemostasis : official journal of the International Academy of Clinical and Applied Thrombosis/Hemostasis 2023

PubMed DOI

B Effect of potassium citrate supplement on stone recurrence before or after lithotripsy: systematic review and meta-analysis

Meta Analysis Urolithiasis 2017

PubMed DOI

C Effect of Regional Citrate Anticoagulation vs Systemic Heparin Anticoagulation During Continuous Kidney Replacement Therapy on Dialysis Filter Life Span and Mortality Among Critically Ill Patients With Acute Kidney Injury: A Randomized Clinical Trial.

Rct JAMA

PubMed DOI

C Systematic review and meta-analysis: sodium picosulfate/magnesium citrate vs. polyethylene glycol for colonoscopy preparation

Meta Analysis European journal of clinical pharmacology 2016

PubMed DOI

C Potassium citrate prevents increased urine calcium excretion and bone resorption induced by a high sodium chloride diet

Rct The Journal of clinical endocrinology and metabolism 2002

PubMed

C Magnesium citrate supplementation decreased blood pressure and HbA1c in normomagnesemic subjects with metabolic syndrome: a 12-week, placebo-controlled, double-blinded pilot trial

Rct Magnesium research 2021

PubMed DOI

C The efficacy of vitamin D combined with clomiphene citrate in ovulation induction in overweight women with polycystic ovary syndrome: a double blind, randomized clinical trial.

Rct Endocrine

PubMed DOI

C Impact of Clomiphene Citrate on the Steroid Profile in Dysmetabolic Men with Low Testosterone Levels.

Rct Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et metabolisme

PubMed DOI

View all evidence for Magnesium Citrate →