Ultra-Cal Night With Vitamin K by Source Naturals — Ingredients, Evidence & Safety

🟢 100/100

This product looks safe

No ingredients exceed tolerable upper intake levels
47% of ingredients have research evidence

A Label Compliance Grade

Product Label

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Label Data

2 Tablet(s) Serving Size

30 Servings

Botanical with Nutrients Product Type

47% Evidence Coverage

Supplement Facts — Evidence Check

Calories

10 Calorie(s)

Total Carbohydrates

2 Gram(s) (1% DV)

Vitamin C

144 mg (240% DV)

Vitamin D3

100 IU (25% DV)

✅ Within RDA (0.2× RDA of 0.015 mg) 📚 604 studies (Tier A: 16, B: 251)

RDA 0.015mg This product: 0.0025mg UL 0.1mg

Vitamin K-1

500 mcg (625% DV)

📊 4.2× RDA — above typical dose 📚 273 studies (Tier A: 9, B: 175)

RDA 0.12mg This product: 0.5mg

Vitamin B6

10 mg (500% DV)

📊 7.7× RDA — above typical dose (UL: 100 mg) 📚 113 studies (Tier A: 3, B: 35)

RDA 1.3mg This product: 10mg UL 100mg

Folate

100 mcg (25% DV)

✅ Within RDA (0.2× RDA of 0.4 mg) 📚 225 studies (Tier A: 10, B: 105)

RDA 0.4mg This product: 0.1mg UL 1.0mg

Calcium

300 mg (30% DV)

Magnesium

300 mg (75% DV)

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

This product: 300mg

Zinc

4 mg (27% DV)

✅ Within RDA (0.4× RDA of 11 mg) 📚 258 studies (Tier A: 6, B: 134)

RDA 11mg This product: 4mg UL 40mg

Copper

500 mcg (25% DV)

✅ Within RDA (0.6× RDA of 0.9 mg) 📚 36 studies (Tier A: 0, B: 11)

RDA 0.9mg This product: 0.5mg UL 10mg

Manganese

4 mg (200% DV)

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

RDA 2.3mg This product: 4mg UL 11mg

Sodium

5 mg (1% DV)

SoyLife non-GMO Isoflavone Complex

414 mg

L-Lysine

30 mg

📊 Market median: 500.0mg (159 products)

Median 500.0mg This product: 30mg

Silica

4 mg

📊 Market median: 108.0mg (8 products) 📚 9 studies (Tier A: 0, B: 4)

This product: 4mg

Boron

1.5 mg

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

This product: 1.5mg UL 20mg

Other Ingredients

Stearic Acid modified Cellulose Gum Acacia Gum Sorbitol Silica Magnesium Stearate

Label Claims — Verification

❓ Nutrient

❓ All Other

❓ Structure/Function

All Other (100% of products) Structure/Function (84% of products) Nutrient (73% of products)

Target Groups

Adult (18 - 50 Years)

Product Information

📋 Directions for Use

Ultra-Cal Night is specifically designed to be taken at night.

Suggested Use: To maximize calcium utilization, take 1 tablet at breakfast and dinner, and 2 tablets at bedtime.

⚠️ Warnings & Precautions

Caution: If you are taking anticoagulant drugs, such as warfarin (Coumadin), or if you are pregnant, may become pregnant, or breastfeeding, consult your health care professional before using this product.

If you experience an uncomfortable laxative effect, simply decrease your dosage.

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

Keep out of the reach of children.

Contains soy.

🧪 Formulation Notes

Non-GMO soy

With vitamin K

Ultra-Cal Night is a scientifically advanced calcium formula, providing optimal forms of calcium and key co-nutrients to help support a healthy skeletal system.

Ultra-Cal Night contains a 1:1 ratio of calcium and magnesium, along with other bone minerals such as copper, manganese and zinc, and soy isoflavones to provide support for bones.

Contains soy.

Additional Information

Superior bioactivity

Krebs cycle calcium complex

Most of the minerals are bound to organic compounds of the Krebs cycle (cellular energy production system), allowing for optimal absorption and utilization.

Research indicates that food eaten during the day usually maintains adequate calcium levels in the blood. Taking calcium supplements at night offers added protection until breakfast.

Not genetically modified

SN1852 REV G173-B

Product Details

UPC / SKU 0 21078 01852 0

DSLD Entry Date 2017-09-21

Product Type Botanical with Nutrients

Form Tablet or Pill

Brand Source Naturals

DSLD ID 78778

Data Updated 2026-04-11

Research Evidence

332 Research Sources

59 Avg Quality Score

220 Meta Analysis

56 Systematic Review

30 Rct

16 Clinical Trial

3 Guideline

3 Regulatory Source

1 Narrative Review

1 Other

1 Openfda Safety

A Duration of treatment with vitamin K antagonists in symptomatic venous thromboembolism

Meta Analysis The Cochrane database of systematic reviews 2014

PubMed DOI Cochrane

A Antiplatelet and anticoagulant agents for secondary prevention of stroke and other thromboembolic events in people with antiphospholipid syndrome

Meta Analysis The Cochrane database of systematic reviews 2017

PubMed DOI

A Anticoagulants (extended duration) for prevention of venous thromboembolism following total hip or knee replacement or hip fracture repair

Meta Analysis The Cochrane database of systematic reviews 2016

PubMed DOI

A Antiplatelet and anticoagulant agents for secondary prevention of stroke and other thromboembolic events in people with antiphospholipid syndrome

Meta Analysis The Cochrane database of systematic reviews 2020

PubMed DOI

A Direct factor Xa inhibitors versus low molecular weight heparins or vitamin K antagonists for prevention of venous thromboembolism in elective primary hip or knee replacement or hip fracture repair

Meta Analysis The Cochrane database of systematic reviews 2025

PubMed DOI

A Factor Xa inhibitors versus vitamin K antagonists for preventing cerebral or systemic embolism in patients with atrial fibrillation

Meta Analysis The Cochrane database of systematic reviews 2018

PubMed DOI

A Antiplatelet agents and anticoagulants for hypertension

Systematic Review The Cochrane database of systematic reviews 2022

PubMed DOI

A Primary prophylaxis for venous thromboembolism in ambulatory cancer patients receiving chemotherapy

Meta Analysis The Cochrane database of systematic reviews 2012

PubMed DOI

A Factor Xa inhibitors versus vitamin K antagonists for preventing cerebral or systemic embolism in patients with atrial fibrillation