PowerCal 1000 mg by Zahler — Ingredients, Evidence & Safety

🟢 100/100

This product looks safe

No ingredients exceed tolerable upper intake levels
38% of ingredients have research evidence

A Label Compliance Grade

Product Label

📄 Open Full PDF View on NIH DSLD →

📸

Have a supplement label? Find it here.

Upload a photo of any supplement label to search our database of 92,312 products.

Label Data

4 Tablet(s) Serving Size

45 Servings

Botanical with Nutrients Product Type

38% Evidence Coverage

Supplement Facts — Evidence Check

Calcium

1000 mg (100% DV)

Magnesium

750 mg (187.5% DV)

📊 Market median: 4002.0mg (1 products) 📚 20 studies (Tier A: 0, B: 2)

This product: 750mg

Zinc

10 mg (66.67% DV)

✅ Within RDA (0.9× RDA of 11 mg) 📚 258 studies (Tier A: 6, B: 134)

RDA 11mg This product: 10mg UL 40mg

Manganese

3 mg (150% DV)

✅ 1.3× RDA — within safe limits 📚 8 studies — no high-quality reviews

RDA 2.3mg This product: 3mg UL 11mg

Vitamin D3

1000 IU (250% DV)

✅ 1.7× RDA — within safe limits 📚 604 studies (Tier A: 16, B: 251)

RDA 0.015mg This product: 0.025mg UL 0.1mg

Boron

3 mg

📊 Market median: 3.0mg (58 products) 📚 2 studies — no high-quality reviews

This product: 3mg UL 20mg

Strontium

650 mg

Oat Straw

40 mg

Other Ingredients

Stearic Acid Magnesium Stearate Croscarmellose Sodium Cellulose Silicon Dioxide

Label Claims — Verification

❓ All Other

❓ Structure/Function

All Other (99% of products) Structure/Function (85% of products) Nutrient (54% of products) Approved Health (3% of products)

Target Groups

Adult (18 - 50 Years) Kosher

Product Information

📋 Directions for Use

Directions: 2 tablets 2 times daily with meals.

⚠️ Warnings & Precautions

KEEP OUT OF REACH OF CHILDREN.

🧪 Formulation Notes

KOSHER PAREVE

UNDER STRICT SUPERVISION OF RABBI SH. STERN

Additional Information

You may need additional supplements to support a healthy diet, consult your nutritionist for a formula that is right for you, or call us toll free at 877-ASK-ZAHLER (877-275-9245)

Calcium is vital for strong bones and teeth, and healthy gums. It also helps to maintain a regular heartbeat, and aids in muscle contraction and neurotransmitter release.

TRIPLE CERTIFIED FORMULA

advanced nutrition ZAHLER(R)

Advanced Calcium Formula Strengthens Bones, Teeth & Gums

THIS PRODUCT WAS MANUFACTURED IN A GMP CERTIFIED FACILITY

BONE & JOINT {tablet}

STORE TIGHTLY IN COOL, DRY PLACE.

Lowers the risk of: ~Weak Bones ~Osteoporosis ~Rickets ~Poor Blood Clotting ~Kidney Stones ~PMS

Strengthens Bones, Teeth & Gums

Product Details

UPC / SKU 7 79663 11010 3

DSLD Entry Date 2014-05-23

Product Type Botanical with Nutrients

Form Tablet or Pill

Brand Zahler

DSLD ID 33331

Data Updated 2026-04-11

Research Evidence

849 Research Sources

56 Avg Quality Score

450 Meta Analysis

152 Rct

137 Systematic Review

73 Clinical Trial

11 Regulatory Source

7 Other

7 Guideline

3 Openfda Safety

2 Cochrane Review

2 Observational

A Phosphate binders for preventing and treating chronic kidney disease-mineral and bone disorder (CKD-MBD)

Meta Analysis The Cochrane database of systematic reviews 2018

PubMed DOI Cochrane

A Calcium supplementation (other than for preventing or treating hypertension) for improving pregnancy and infant outcomes

Meta Analysis The Cochrane database of systematic reviews 2024

PubMed DOI Cochrane

A Calcium supplementation (other than for preventing or treating hypertension) for improving pregnancy and infant outcomes

Meta Analysis The Cochrane database of systematic reviews 2015

PubMed DOI Cochrane

A Vitamin and mineral supplementation for maintaining cognitive function in cognitively healthy people in mid and late life

Meta Analysis The Cochrane database of systematic reviews 2018

PubMed DOI Cochrane

A Calcium supplementation during pregnancy for preventing hypertensive disorders and related problems

Meta Analysis The Cochrane database of systematic reviews 2025

PubMed DOI Cochrane

A Dietary calcium supplementation for preventing colorectal cancer and adenomatous polyps

Systematic Review The Cochrane database of systematic reviews 2008

PubMed DOI Cochrane

A Calcium and vitamin D for increasing bone mineral density in premenopausal women

Systematic Review The Cochrane database of systematic reviews 2023

PubMed DOI Cochrane

A Dietary sodium, sodium-to-potassium ratio, and risk of stroke: A systematic review and nonlinear dose-response meta-analysis

Meta Analysis Clinical nutrition (Edinburgh, Scotland) 2019

PubMed DOI

A The association between circulating magnesium and clinically relevant outcomes in patients with chronic kidney disease: A systematic review and meta-analysis

Meta Analysis Clinical nutrition (Edinburgh, Scotland) 2021

PubMed DOI

A Calcium channel blockers versus other classes of drugs for hypertension

Systematic Review The Cochrane database of systematic reviews 2021

PubMed DOI

View all evidence for Electrolytes →