Calcium Citrate

100% clean formula.

Suitable for vegetarians and vegans. All Ethical Nutrition products are free from animal-based ingredients and by-products. Registered with the vegan society.

Free-from: GMOs, Magnesium Stearate, Gelatin, Palm Oil/Palm Oil Derivatives, Maltodextrin, Bulking Agents, Titanium Dioxide, Sugar.

No Allergen-Containing Ingredients: This product is formulated without any ingredients from the top 14 allergens, including wheat, milk, nuts, soy, and shellfish.

Additive-free: We don't use any nasty additives and where required we use gluten-free rice extract to help us to blend together ingredients and ensure they are accurately dosed.

Calcium is essential for a wide range of functions:

• Development and maintenance of strong bones. Over 90% of your body’s calcium is in the mineral matrix inside bones. Low calcium intake appears to be positively correlated with the development of osteoporosis [1].
• Nerve signal transmission and maintain a healthy nervous system. Calcium helps stabilize cell membranes and regulate excitatory neurons [2].
• Muscle function. Muscle fibres rely on calcium and magnesium to be able to contract and relax properly. An imbalance in either mineral can lead to muscle cramps and spasms. 
• Dental health. Calcium is critical for healthy tooth development and the strength and integrity of bones in the jaw.
• Blood clotting. One of the less well-known roles calcium plays in the body is in blood clotting processes [3]. 
• Maintaining a normal heart rhythm. Your heart is a large muscle and like any other muscle cells, it relies on calcium to contract properly. Calcium ions are used by heart cells when they contract and pump blood [4]. It's also needed for the heart's electrical rhythms. Too much or too little calcium in the bloodstream can cause arrhythmia.
• Female hormone balance. Calcium works in partnership with nutrients like magnesium and vitamin B6 to regulate hormonal activity. Randomized controlled trials have demonstrated the effectiveness of calcium for relieving PMS (pre-menstrual syndrome) symptoms both as a stand-alone supplement and in conjunction with vitamin B6 [5,6].

The most commonly prescribed calcium supplements are made from calcium carbonate. It’s a cheap form of calcium with a much lower absorption rate than calcium citrate and often causes constipation.

Calcium carbonate is also used in over-the-counter indigestion remedies because it’s good at neutralising stomach acid. However, stomach acid is vital for liberating zinc, magnesium, and other bone-building nutrients from food. 

Calcium citrate has a higher absorption rate than the carbonate form. It doesn't neutralise stomach acid and is unlikely to cause any digestive side effects. 

There's slightly less elemental calcium in the citrate version than in carbonate but this is offset by the higher bioavailability and absorption rate.

Calcium citrate is the preferred form of calcium for bone health because of its high bioavailability and absorption rate and low risk of side effects.

Calcium citrate may be helpful for people who want to:

• Enhance their dietary intake of calcium. If your diet is low in leafy greens, nuts and seeds, pulses, or dairy products you may benefit from extra calcium.
• Maintain bone density and strength.
• Manage osteopenia or osteoporosis.
• Support their dental health.
• Manage muscle cramps.
• Support nerve signalling and a healthy heart rhythm.
• Manage PMS symptoms.

Yes, calcium supplements can interact with many types of medication including antibiotics and thyroid medication. We recommend you speak to your healthcare provider before taking calcium citrate alongside any prescription medications or other mineral supplements.

People with hyperparathyroidism, prostate cancer, kidney stones, or chronic kidney disease should not supplement calcium without medical supervision

Unlike cheap forms of calcium carbonate, our calcium citrate is well tolerated and unlikely to cause digestive issues.

1. Voulgaridou, G., Papadopoulou, S. K., Detopoulou, P., Tsoumana, D., Giaginis, C., Kondyli, F. S., Lymperaki, E., & Pritsa, A. 2023. Vitamin D and Calcium in Osteoporosis, and the Role of Bone Turnover Markers: A Narrative Review of Recent Data from RCTs. Diseases (Basel, Switzerland), 11(1), 29. https://doi.org/10.3390/diseases11010029 
2. Pikor, D., Hurła, M., Słowikowski, B., Szymanowicz, O., Poszwa, J., Banaszek, N., Drelichowska, A., Jagodziński, P. P., Kozubski, W., & Dorszewska, J. 2024. Calcium Ions in the Physiology and Pathology of the Central Nervous System. International Journal of Molecular Sciences, 25(23), 13133. https://doi.org/10.3390/ijms252313133 
3. LeBrasseur, N. 2003. Calcium for strong clotting. The Journal of Cell Biology, 160(7), 980. https://doi.org/10.1083/jcb1607iti2 
4. Maltsev, V. A., & Lakatta, E. G. 2007. Normal heart rhythm is initiated and regulated by an intracellular calcium clock within pacemaker cells. Heart, Lung & Circulation, 16(5), 335–348. https://doi.org/10.1016/j.hlc.2007.07.005 
5. Shobeiri, F., Araste, F. E., Ebrahimi, R., Jenabi, E., & Nazari, M. 2017. Effect of calcium on premenstrual syndrome: A double-blind randomized clinical trial. Obstetrics & Gynecology Science, 60(1), 100. https://doi.org/10.5468/ogs.2017.60.1.100
6. Masoumi, S. Z., Ataollahi, M., & Oshvandi, K. 2016. Effect of Combined Use of Calcium and Vitamin B6 on Premenstrual Syndrome Symptoms: a Randomized Clinical Trial. Journal of Caring Sciences, 5(1), 67–73. https://doi.org/10.15171/jcs.2016.007