Mineral

Calcium citrate

Calcium citrate combines calcium with citric acid and provides approximately 21% elemental calcium by weight. Its solubility depends less on stomach acidity than calcium carbonate.

Calcium supports normal bone structure, tooth maintenance, muscle contraction and nerve signalling.

In everyday life, Calcium Citrate helps build the mineral foundation for stronger-feeling daily movement, dependable muscle function and long-term bone maintenance.

The elemental mineral amount is more meaningful than the weight of its source compound.

Available in

1 product

Ingredient overview

What it is

Calcium citrate combines calcium with citric acid and provides approximately 21% elemental calcium by weight. Its solubility depends less on stomach acidity than calcium carbonate.

  • Scientific identity: Calcium Citrate; ingredient form: Tricalcium dicitrate.
  • How it works: Dissolves independently of stomach acid: The citrate pairing keeps the calcium soluble whether or not stomach acid is plentiful, unlike calcium carbonate. Absorbed in the small intestine: Freed calcium ions are taken up along the gut wall, actively at lower doses and passively at higher ones.
  • Primary function: Calcium supports normal bone structure, tooth maintenance, muscle contraction and nerve signalling.
  • What it supports: Calcium Citrate helps build the mineral foundation for stronger-feeling daily movement, dependable muscle function and long-term bone maintenance.
  • Important consideration: The elemental mineral amount is more meaningful than the weight of its source compound.

Formulation rationale

Why we use it

CARPEDIEM selected Calcium Citrate for a clearly defined role within a thoughtfully balanced formulation.

  • Formulation purpose: Calcium supports normal bone structure, tooth maintenance, muscle contraction and nerve signalling.
  • Used in: CARPEDIEM BoneMax and CARPEDIEM Women’s Bone & Daily Wellness Stack.
  • Works alongside: Calcium Citrate complements Vitamin D3 and Magnesium to support balanced daily mineral nutrition.
  • Meaningful contribution: Calcium Citrate helps build the mineral foundation for stronger-feeling daily movement, dependable muscle function and long-term bone maintenance. Contributes to normal muscle contraction, including the everyday mechanics of movement.
  • Quality and scientific context: The elemental mineral amount is more meaningful than the weight of its source compound. 1 ingredient-specific study is included because the research reports a relevant benefit.

Ingredient intelligence

How it works

The calcium form that dissolves whether or not there is stomach acid.

Step 01 / 04

Dissolves on its own.

Paired with citrate, it does not need stomach acid to break down - unlike calcium carbonate, which does.

01 / 04

Chemical form

Tricalcium dicitrate

Elemental calcium

~21 per cent by weight

Stomach acid

Not required - take any time

Absorption ceiling

About 500 mg per dose

Descriptive of the ingredient's established biology. Not a claim to diagnose, treat, cure or prevent any disease.

All key functions

The complete functional profile connected with this ingredient.

Supports the maintenance of strong, healthy bones and the normal structure of teeth.

Provides a soluble calcium form that depends less on stomach acid for dissolution.

Contributes to normal muscle contraction, including the everyday mechanics of movement.

Supports the nerve-signalling pathways that help muscles and tissues work together.

Helps supply the elemental calcium needed for ongoing bone-mineral maintenance.

Can be incorporated flexibly into daily nutrition with or without a full meal.

Helps build the mineral foundation for stronger-feeling daily movement, dependable muscle function and long-term bone maintenance.

Pairs with Vitamin D3 and Magnesium to support a more complete and scientifically balanced formula.

Selected research

Open the original paper, PubMed record or DOI page for the full publication.

01

Meta-analysis of calcium bioavailability: a comparison of calcium citrate with calcium carbonate

American Journal of Therapeutics

Fifteen trials, 184 subjects, one clear answer. Pooling every published head-to-head comparison, calcium absorption from calcium citrate was consistently higher than from calcium carbonate — by 27% on an empty stomach and by 22% when taken with a meal. Carbonate is the cheap default in most calcium supplements because it packs more calcium per tablet; citrate costs more and needs a bigger tablet. This is the evidence for paying that price. It is also why citrate does not depend on strong stomach acid to dissolve, which matters as people age and for anyone on acid-reducing medication.
1999
02

Pharmacokinetic and pharmacodynamic comparison of two calcium supplements in postmenopausal women

The Journal of Clinical Pharmacology

A randomised crossover trial in postmenopausal women measuring three separate markers of what the body actually does with a calcium dose: serum calcium, urinary calcium and parathyroid hormone. Calcium citrate outperformed calcium carbonate on all three — including a greater suppression of parathyroid hormone, the signal the body sends to pull calcium back out of bone when blood levels run short.
2000
03

Pharmacokinetic and pharmacodynamic comparison of two calcium supplements in postmenopausal women

The Journal of Clinical Pharmacology

This randomized crossover study compared equal elemental doses of calcium citrate and calcium carbonate in postmenopausal women. Calcium citrate produced a larger serum-calcium response and greater suppression of parathyroid hormone in the tested conditions.
2000

Products containing Calcium citrate

Explore the Carpediem formulations connected with this ingredient.

Complementary by function

Ingredient intelligence

How it works

The calcium form that dissolves whether or not there is stomach acid.

Step 01 / 04

Dissolves on its own.

Paired with citrate, it does not need stomach acid to break down - unlike calcium carbonate, which does.

01 04

Chemical form

Tricalcium dicitrate

Elemental calcium

~21 per cent by weight

Stomach acid

Not required - take any time

Absorption ceiling

About 500 mg per dose

Descriptive of the ingredient's established biology. Not a claim to diagnose, treat, cure or prevent any disease.