Home/ Supplements/ Vitamin C/ Ultra-Cal 1000

Ultra-Cal 1000

product on market Capsule Source Naturals Safety: 100/100
100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 67% of ingredients have research evidence
A Label Compliance Grade

What the Evidence Says

✨ AI-generated · Qwen 3.6 · methodology

This formula combines vitamins D3 and K-1 and K-2, which have strong evidence for supporting bone health and calcium regulation. Vitamin C and protein provide general nutritional support, though their specific roles in this combination are less emphasized in clinical research. The ingredient profile is supported by a high safety score.

AI-generated summary based on research evidence. Not medical advice.

Label

Product Label

Label for Ultra-Cal 1000
Open Full PDF View on NIH DSLD →
Details

Label Data

3 Capsule(s)
Serving Size
20
Servings
Other Combinations
Product Type
67%
Evidence Coverage
Ingredients

Supplement Facts — Evidence Check

Protein
1 Gram(s) (2% DV)
Vitamin C
100 mg (167% DV)
500 IU (125% DV)
Within RDA (0.8× RDA) 608 studies (A:16, B:251)
100 mcg (125% DV)
Within RDA (0.8× RDA) 275 studies (A:9, B:175)
10 mcg (12% DV)
Within RDA (0.1× RDA) 275 studies (A:9, B:175)
200 mcg (50% DV)
Within RDA (0.5× RDA) 226 studies (A:10, B:105)
100 mcg (1667% DV)
41.7× RDA — above typical dose 139 studies (A:1, B:44)
Calcium
500 mg (50% DV)
250 mg (63% DV)
Within RDA (0.6× RDA) 316 studies (A:8, B:159)
5 mg (34% DV)
Within RDA (0.5× RDA) 263 studies (A:6, B:134)
500 mcg (25% DV)
Within RDA (0.6× RDA) 37 studies (A:0, B:11)
200 mg (20% DV)
Within RDA (0.3× RDA) 13 studies (A:0, B:3)
1 mg (50% DV)
Within RDA (0.4× RDA) 9 studies — no high-quality reviews
Market median: 1000.0mg (1115 products) 24 studies (A:0, B:9)
1.5 mg
Market median: 3.0mg (58 products) 3 studies — no high-quality reviews

Other Ingredients

Gelatin Silica Magnesium Stearate
Claims

Label Claims — Verification

Unverified Nutrient
Unverified All Other
Unverified Structure/Function
Info

Product Information

Directions for Use

Suggested Use: 3 capsules twice daily.

Warnings & Precautions

Contains shellfish (shrimp and crab).

Warning: Do not use if you have a history of gallstones, bile duct obstruction, hyperacidity, or gastrointestinal disorders.

Consult your health care professional before using this product if you are pregnant, may become pregnant, breastfeeding, regularly taking acetaminophen, warfarin (Coumadin), heparin, or any prescription drug, or if you suffer from kidney or parathyroid disease.

Do not use if either tamper-evident seal is broken or missing.

Keep out of the reach of children.

Formulation Notes

Contains shellfish (shrimp and crab).

This formula contains 1,000 mg of bioavailable calcium as well as a wide array of nutrients specifically formulated to support enhanced bone mass and strength. This formula also contains trace minerals that act as cofactors for the production of bone—phosphorus, magnesium, zinc, copper, and manganese.

Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no sugar, salt, preservatives, or artificial color, flavor or fragrance.

Additional Information

Comprehensive bone health

Bones consist of living cells embedded in a mineralized organic matrix. This intricate structure serves us well, but as we enter middle age, our bone mass starts to decline.

SN2213 REV E173-B

Metadata

Product Details

UPC / SKU0 21078 02213 8
DSLD Entry Date2017-09-21
Product TypeOther Combinations
FormCapsule
BrandSource Naturals
DSLD ID78793
Data Updated2026-04-11
Research

Research Evidence

371
Research Sources
54
Avg Quality
148
Meta Analysis
82
Systematic Review
71
Rct
62
Clinical Trial
2
Regulatory Source
1
Cochrane Review
1
Narrative Review
1
Other
1
Openfda Safety
A Vitamin C supplementation in pregnancy
Meta Analysis The Cochrane database of systematic reviews 2015 PubMed DOI
A Vitamin C supplementation for the primary prevention of cardiovascular disease
Systematic Review The Cochrane database of systematic reviews 2017 PubMed DOI
A Vitamin C for preventing and treating the common cold
Meta Analysis The Cochrane database of systematic reviews 2013 PubMed DOI
A Vitamin C for preventing and treating pneumonia
Meta Analysis The Cochrane database of systematic reviews 2013 PubMed DOI
A Vitamin E supplementation in pregnancy
Meta Analysis The Cochrane database of systematic reviews 2015 PubMed DOI
A Vitamin C supplementation for prevention and treatment of pneumonia
Meta Analysis The Cochrane database of systematic reviews 2020 PubMed DOI
A Vitamin C supplementation for prevention and treatment of pneumonia
Systematic Review The Cochrane database of systematic reviews 2021 PubMed DOI
A Nutritional interventions for preventing and treating pressure ulcers
Meta Analysis The Cochrane database of systematic reviews 2024 PubMed DOI
A Does Vitamin C Supplementation Provide a Protective Effect in Periodontal Health? A Systematic Review and Meta-Analysis
Meta Analysis International journal of molecular sciences 2024 PubMed DOI
A Circulating vitamin C concentration and risk of cancers: a Mendelian randomization study
Meta Analysis BMC medicine 2021 PubMed DOI
View all evidence for Vitamin C →
Compare

Similar Products

Vitamin C Ester Ascorbyl Palmitate
OL Olympian Labs · Capsule
100
Vitamin C 1000 mg
PurHEALTH · Capsule
100
Ultra C Buffered
New Sun · Capsule
100
Black Elderbarry with Liposomal Vitamin C & Zinc
SunVita Health · Capsule
100
Natural Vitamin C
Herbadiet · Capsule
100
View all Vitamin C products →
Vitamin C research Best Vitamin C All Vitamin C products More from Source Naturals View on NIH DSLD →

This product page is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before taking any supplement.