Calcium Citrate Powder
| ✓Assay 97.5–100.5% · USP standard | ✓Calcium content 20.3–23% |
| ✓Vegan calcium powder · no fillers | ✓Non-GMO · not irradiated · TSE/BSE free |
| ✓Screened against WADA and IOC banned lists | ✓Not tested on animals |
| ✓100g · 250g · 500g · 1kg · 2kg · 5kg | ✓Same day dispatch before 3:30pm, Mon–Fri |
What Is Calcium Citrate Powder?
Calcium citrate powder is the calcium salt of citric acid, supplied here as pure tricalcium citrate tetrahydrate to USP standard. It is one of the two calcium forms most commonly used in food supplements, the other being calcium carbonate.
Our calcium citrate powder contains between 20.3% and 23% elemental calcium, so a 1g serving provides around 210mg of actual calcium. There is nothing else in the bag — no fillers, no anti-caking agents, no flow agents and no bulking agents. What you weigh out is what you take.
We supply it as a retail calcium powder in 100g to 500g packs, and as bulk calcium citrate powder in 1kg, 2kg and 5kg for capsule fillers, tablet manufacturers, blenders and white label brands. Every size is the same material from the same UK-held stock.
What Calcium Contributes To
These are the authorised UK health claims for calcium, in their approved wording, with a plain-English note on what each one means. A 1g serving of this calcium citrate powder provides 26% NRV, which is well above the level required to make them.
Calcium is needed for the maintenance of normal bones.
Calcium is needed for the maintenance of normal teeth.
Calcium contributes to normal muscle function.
Calcium contributes to normal neurotransmission.
Calcium contributes to normal blood clotting.
Calcium contributes to normal energy-yielding metabolism.
Calcium contributes to the normal function of digestive enzymes.
Calcium has a role in the process of cell division and specialisation.
Calcium Citrate vs Calcium Carbonate
These are the two calcium forms you will come across most often, and they behave differently. Neither is simply better — it depends what you need.
| Calcium Citrate | Calcium Carbonate | |
|---|---|---|
| Elemental calcium | Around 21% | Around 40% |
| Needs stomach acid | No | Yes |
| Take with food? | With or without | Best with a meal |
| Serving size for same calcium | Larger | Smaller |
| Water solubility | Slightly soluble | Practically insoluble |
The short version: calcium carbonate packs more calcium into less powder, but relies on stomach acid and is best taken with a meal. Calcium citrate is less concentrated, so you weigh out more of it, but it does not depend on stomach acid and can be taken at any time of day.
Pack Sizes — Retail and Bulk
Select your size from the dropdown above. Servings shown at a 1g serving of calcium citrate powder, which provides approximately 210mg elemental calcium.
| Size | Servings at 1g | Best For |
|---|---|---|
| 100g | 100 | First order · trial size · home use |
| 250g | 250 | Regular personal use · around 8 months |
| 500g | 500 | Best value for personal use · self-encapsulators |
| 1kg | 1,000 | Small-batch production · households · clubs |
| 2kg | 2,000 | Trade · blenders · capsule and tablet production |
| 5kg | 5,000 | Manufacturers · white label · wholesale accounts |
Read This Before You Order
Calcium citrate is only slightly soluble in water. It will not dissolve into a clear solution the way a powdered drink mix does. Stirred into water or juice it will disperse and then settle, so you need to stir and drink it straight away, or take it in food, or fill it into capsules.
We say this up front because it is the single most common reason people are disappointed by a calcium citrate powder. Plenty of listings describe this material as easy-mix or highly soluble. It isn't, and that is a property of the calcium salt rather than a fault with any particular batch.
It is a fine white crystalline powder passing 20–80 mesh, with a characteristic taste. If you want something that dissolves cleanly in a glass of water, this is not the right calcium salt for you.
How to Use Calcium Citrate Powder
Measuring Your ServingUse a milligram-accurate scale. A 1g serving provides approximately 210mg elemental calcium, which is 26% NRV. Calcium is best taken in divided amounts through the day rather than all at once.
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Taking ItStir into water or juice and drink immediately, mix into food, or fill your own capsules. Unlike calcium carbonate, calcium citrate does not need stomach acid to be absorbed, so it does not have to be taken with a meal.
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Filling Your Own CapsulesFills readily into size 00 and size 0 capsules. The 20–80 mesh crystalline grade flows well through a capsule filling machine without needing a flow agent added.
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StorageKeep the bag tightly sealed in a cool place away from moisture and direct sunlight. Reseal after every use — the powder will take up moisture from the air if left open.
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Full Calcium Citrate Powder Specification
| Product | Calcium Citrate Powder (~21% Ca) |
| Chemical Name | Tricalcium Citrate Tetrahydrate — tetrahydrated tricalcium salt of citric acid |
| CAS Number | 5785-44-4 |
| EC / EINECS Number | 212-391-7 |
| Molecular Formula | (C₆H₅O₇)₂Ca₃·4H₂O · MW 570.49 |
| E Number | E333(iii) |
| Assay | 97.5 – 100.5% as Ca₃(C₆H₅O₇)₂ |
| Calcium Content | 20.3 – 23.0% elemental calcium |
| Pharmacopeia Standard | USP |
| Appearance | Fine white crystalline powder · characteristic aroma and flavour |
| Particle Size | Minimum 80% passing 20–80 mesh |
| Solubility | Slightly soluble in water · almost insoluble in ethanol |
| Loss on Drying | 10.0 – 14.0% |
| Acid-Insoluble Substances | Max 0.2% |
| Fluorides / Oxalates | Max 30ppm · Max 100ppm |
| Heavy Metals | Total max 20mg/kg · Lead max 1 · Cadmium max 1 · Mercury max 0.1 · Arsenic max 1 · Aluminium max 30mg/kg |
| Microbiology | Total Viable Count max 1,000 CFU/g · Yeasts and moulds max 100 CFU/g · E. coli negative /1g · Salmonella negative /25g |
| Ingredients | 100% Tricalcium Citrate. Nothing else added — no fillers, no anti-caking agents, no flow agents |
| Suitable For | Vegans · Vegetarians · Non-GMO |
| Country of Origin | China · shipped from our UK factory |
| Shelf Life | Minimum 2 years from manufacture · store sealed, cool, dry, away from sunlight |
Quality & Compliance
This calcium citrate powder is supplied to us with a full technical dossier. The following is documented by the manufacturer:
| ✓Free of TSE and BSE and compliant with UK requirements |
| ✓Not manufactured from GM raw materials |
| ✓Not subjected to ionising radiation |
| ✓No contact with nandrolone or its precursors |
| ✓No contact with substances banned by the IOC or WADA |
| ✓Not tested on animals at any stage of manufacture |
| ✓Complies with maximum residue limits on pesticides |
| ✓Contains no nanomaterials · food grade packaging |
| ✓Complies with PAH and pyrrolizidine alkaloid limits |
Allergen Information
The manufacturer's documented allergen risk assessment records no allergens present in this material, and states that none of the listed allergens are handled at the manufacturing site, so there is no identified risk of cross contamination.
The assessment covers peanuts, tree nuts, sesame, milk and lactose, egg, gluten-containing cereals, soya, lupin, mustard, celery, fish, molluscs, crustaceans, sulphites, gelatine, maize and animal derivatives. Note that this is a documented risk assessment rather than individual testing of every allergen in every batch. If you are formulating a product that will carry a "free from" claim, you should carry out your own confirmatory testing.
Calcium Citrate Powder — Frequently Asked Questions
How much calcium is in 1g of calcium citrate powder?
Approximately 210mg of elemental calcium, which is 26% of the Nutrient Reference Value. Our material is specified at 20.3–23% calcium content, so the figure varies slightly between batches within that range.
Does calcium citrate powder dissolve in water?
Only slightly. It disperses when stirred and then settles, so drink it straight away rather than leaving it standing. Many buyers prefer to mix it into food or fill their own capsules instead.
Is calcium citrate better than calcium carbonate?
Neither is simply better. Calcium carbonate contains around 40% elemental calcium against roughly 21% for citrate, so you need less powder. But carbonate needs stomach acid to be absorbed and is best taken with a meal, whereas calcium citrate does not and can be taken at any time.
Can I buy bulk calcium citrate powder in the UK?
Yes. We stock 1kg, 2kg and 5kg for trade, and can supply larger quantities to order. Stock is held in the UK and dispatched from our own factory. Contact us for wholesale pricing rather than ordering at list price if you need volume or a scheduled supply.
Is this calcium powder suitable for vegans?
Yes. Calcium citrate is a mineral salt with no animal-derived content, and the supplier confirms it as suitable for both vegans and vegetarians. It is also non-GMO and has not been tested on animals.
Can I use this calcium citrate powder to fill my own capsules?
Yes. The 20–80 mesh crystalline grade flows well and fills readily into size 00 and size 0 capsules without needing a flow agent added. The 500g and 1kg sizes are the most popular with self-encapsulators.
Can I get a certificate of analysis?
Yes, for any order. The full product technical dossier and the batch certificate of analysis are available on request — just message us and we will send them across.
When should I take calcium?
Calcium is generally best taken in divided amounts through the day rather than in one large serving. Because calcium citrate does not depend on stomach acid, it can be taken with or without food.
Bulk Calcium Citrate Powder — Trade & Wholesale UK
The 1kg, 2kg and 5kg sizes supply supplement manufacturers, capsule and tablet producers, white label brands and blending operations. Same material, same documentation, UK-held stock, shipped from our UK factory with same day dispatch.
As a UK calcium citrate supplier we can hold stock against a forecast and quote on volume. Need more than 5kg, or a regular scheduled supply? Message us for trade pricing rather than ordering at list price.
Browse the rest of our bulk powders and raw ingredients, or see our full supplement range.
Why Buy Calcium Citrate Powder From Charge Products
| ✓Family run UK supplier, established 2016 | ✓160,000+ sales · 99.8% positive feedback |
| ✓5 Star Food Hygiene Rating | ✓Encapsulation carried out in-house in the UK |
| ✓Resealable food grade packaging | ✓Same day dispatch before 3:30pm, Mon–Fri |
Food supplement. Not a medicine. Do not exceed the recommended daily intake. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Keep out of the reach of children. Store in a cool, dry place away from direct sunlight and moisture, and keep the pack sealed when not in use. Consult your doctor before use if you are pregnant, breastfeeding, taking any medication or under medical supervision — calcium can affect the absorption of some medicines, including certain antibiotics and thyroid medication, so leave a gap between taking them. Not intended to diagnose, treat, cure or prevent any disease or medical condition.
| Amount of Powder |
100g, 250g, 500g, 1 KG, 2 KG |
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