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CITRACAL

Citracal Maximum Plus D3

4.7· 10,261 Amazon reviews
$14.96$14.21with Subscribe & Save

$0.17/serving

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Price verified Jul 18, 2026

As an Amazon Associate, we earn from qualifying purchases · Not evaluated by the FDA · Individual results may vary · Consult a healthcare provider before use

Our verdict

630mg calcium (as citrate) + 500 IU vitamin D3 per serving (2 caplets) of Calcium Citrate + Vitamin D3 per caplet from CITRACAL. Best for best calcium citrate with D3.

Third-Party TestedCapletSubscribe & SaveClinical Dose

Why we recommend this

The gold standard calcium citrate supplement recommended by more doctors and pharmacists than any other calcium brand. USP Verified for label accuracy and dissolution. Calcium citrate absorbs 22-27% better than carbonate in fasting conditions and can be taken with or without food. Includes 500 IU vitamin D3 per serving for enhanced absorption. Excellent value.

Check for interactions

Already taking other supplements or prescription medications? Add them below to check for documented interactions, severity, and clinical guidance.

Our database currently documents 137+ supplement and drug-category interaction pairs. Combinations not flagged here may still interact — always consult your healthcare provider before combining supplements, especially with prescription medications.

What to watch out for

No vitamin K2 included. Large caplets that some users find hard to swallow. Does not include magnesium. 500 IU vitamin D3 is adequate but lower than some competitors.

Dose & form

Serving
630mg calcium (as citrate) + 500 IU vitamin D3 per serving (2 caplets)
Form
Caplet
Clinical range
500-600mg supplemental calcium, 1-2 times daily
Dose adequacy
Full
Supply
90 servings · $0.17/serving
UPC
016500535362

Who it's best for

Best calcium citrate with D3

Who should skip it

Those wanting vitamin K2 included or avoiding large tablets.

Pros

  • USP Verified (gold standard)
  • Calcium citrate (best-absorbed common form)
  • Doctor and pharmacist recommended
  • Excellent value at $0.18/serving

Cons

  • No vitamin K2 included
  • Large caplets
  • No magnesium
  • Only 500 IU vitamin D3

What customers say

4.7★ across 10,261 Amazon reviews. The most common questions from shoppers: re any potential interactions with medications, re any side effects from long-term use, and cause any digestive issues or side effects. Full answers in the FAQ below.

Frequently Asked Questions

What is the clinical dose for Calcium Citrate + Vitamin D3?

Clinical trials typically use 500-600mg supplemental calcium, 1-2 times daily. Citracal Maximum Plus D3 delivers 630mg calcium (as citrate) + 500 IU vitamin D3 per serving (2 caplets), which we classify as Full relative to that range.

How does Citracal Maximum Plus D3 compare to similar Caplet?

See the "Also consider" section below for two alternatives. Choose based on form preference (Caplet vs alternatives), dose adequacy, and third-party testing.

Is Citracal Maximum Plus D3 third-party tested?

Yes — USP Verified. Third-party testing verifies ingredient identity and label accuracy.

Does this work with Amazon Subscribe & Save?

Yes — Amazon Subscribe & Save is available for this product. Enrolling locks in a recurring delivery at a reduced per-unit price.

Are there any potential interactions with medications?

Calcium citrate may interact with thyroid medications (levothyroxine), antibiotics (tetracyclines, fluoroquinolones), and bisphosphonates — space doses 2-4 hours apart. The included vitamin D3 may interact with thiazide diuretics. Citracal is recommended by doctors partly because of its well-understood interaction profile.

Are there any side effects from long-term use?

At 630mg calcium per serving, Citracal is within safe long-term limits when total daily calcium (food + supplements) stays at 1,000-1,200mg. Calcium citrate causes fewer side effects than carbonate. USP verification ensures consistent quality for ongoing use.

Does it cause any digestive issues or side effects?

Calcium citrate is significantly less likely to cause constipation, gas, and bloating compared to calcium carbonate. This is a primary advantage of the citrate form. Some users report mild digestive effects, but citrate is one of the best-tolerated calcium forms available.

Can it be taken with other supplements or vitamins?

Yes. Citracal already includes vitamin D3 for calcium absorption. Space from iron, zinc, and thyroid medications by 2+ hours. Consider adding vitamin K2 separately — Citracal does not include it. Pairs well with magnesium taken at a different time of day.

Are there any specific instructions for taking it safely?

Take 2 caplets daily with or without food. Citracal can be taken at any time since citrate does not require stomach acid for absorption. For best absorption, take no more than 500-600mg calcium at one time. Those with kidney disease should consult a physician.

How long until benefits are typically experienced?

Calcium supplementation supports bone health over months to years. Measurable bone density improvements typically require 12+ months of consistent use with adequate vitamin D and weight-bearing exercise. The vitamin D3 in Citracal supports calcium absorption from day one.

Also consider

Garden of Life Raw Calcium product image

Garden of Life Raw Calcium

Capsule · Plant-Based Calcium from Algae (Algas Calcareas) · $39.07

$39.07

Integrative Therapeutics OsteoPrime Forte product image

Integrative Therapeutics OsteoPrime Forte

Capsule · Multi-form calcium complex (calcium citrate and four additional calcium forms) · $27.00

$27.00

Part of this guide

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As an Amazon Associate, we earn from qualifying purchases. Some links below are affiliate links — this doesn't affect our editorial independence or product ratings. How we evaluate products

This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

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