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Non-GMO Project Verified · CAS 5785-44-4 · E333

Calcium Citrate Powder Bulk Supplier and Distributor

Captain Drake supplies calcium citrate tetrahydrate (CAS 5785-44-4, E333) in FCC and USP grades, Non-GMO Project Verified and produced from non-GMO cane sugar and tapioca feedstock in Thailand and Colombia. Available as calcium citrate powder and granules in 50 lb bags, 25 kg bags and 2,250 lb tote sacks, LTL through full truckloads of 42,500 lbs.

CAS No.

5785-44-4

E-Number

E333

Grades

FCC · USP

Min. order

2,250 lb

Truckload

42,500 lb

Technical Data

Calcium Citrate Specification

Calcium citrate tetrahydrate is the commercial form, CAS 5785-44-4, E333 — a white crystalline powder or granule delivering roughly 21% elemental calcium. Unlike sodium and potassium citrate it is only sparingly soluble in water, which is the single most important thing to know before formulating with it.

Calcium citrate tetrahydrate — technical specification
Chemical name	Calcium Citrate Tetrahydrate
Synonyms	Tricalcium citrate, calcium citrate tribasic
CAS number	5785-44-4 (tetrahydrate) · 813-94-5 (anhydrous)
EINECS	212-391-7
E-Number	E333 (E333iii)
Molecular formula	Ca₃(C₆H₅O₇)₂·4H₂O
Molecular weight	570.50 g/mol (tetrahydrate)
Elemental calcium	Approx. 21%
Grades available	FCC, USP, Food Grade
Assay	98.0 – 101.0% (dried basis)
Appearance	White crystalline powder or granules
Particle sizes	Powder, Granular
Solubility	Sparingly soluble in water; insoluble in ethanol
Feedstock	Non-GMO cane sugar / non-GMO tapioca starch
Country of origin	Thailand, Colombia
Shelf life	36 months in unopened original packaging
Certifications	Non-GMO Project Verified, Kosher, Halal, ISO 9001 / 14001 / 22000

Function

What Calcium Citrate Is Used For

Three jobs in a formulation: calcium fortification, buffering, and firming. Calcium fortification is the dominant use by volume.

Calcium fortification

Calcium citrate is the preferred calcium source where the product is acidic or where absorption matters — fortified beverages, plant-based dairy alternatives, nutrition powders and clinical nutrition. It does not need stomach acid to dissolve the way calcium carbonate does, and it does not carry carbonate’s chalky mouthfeel.

Buffering and firming

Secondary uses include pH buffering in the same systems as the other citrate salts, and as a firming agent in canned and processed vegetables where calcium stabilises pectin.

The solubility constraint

Calcium citrate is sparingly soluble — around 0.1 g per 100 ml of water at room temperature, versus freely soluble for sodium and potassium citrate. In a clear beverage that means suspension rather than solution, so it is normally specified for opaque systems, powders and tablets, or paired with a suspending agent. Tell us the application and we will confirm whether the particle size you need is achievable.

Bulk Supply

Bulk Calcium Citrate Supply

Sold by the pallet and the truckload. The minimum is one pallet — 2,250 lbs — and a full truckload is 42,500 lbs. Captain Drake is a calcium citrate supplier and importer, not a producer: partner manufacturers run the plants, and we hold US inventory, documentation and delivery from a nationwide network of twelve partner warehouses.

Order tiers and pack formats
Tier / format	Quantity	Notes
LTL — one pallet	2,250 lbs	Pilot runs and contract manufacturers
Full truckload	42,500 lbs	Lowest landed cost per pound
50 lb multi-wall bag	50 lbs	Standard plant intake
25 kg bag	55 lbs	Metric specification programs
2,250 lb tote sack (FIBC)	2,250 lbs	High-volume continuous lines

Because calcium citrate is made from citric acid, its non-GMO status is inherited from the feedstock. No US-produced citric acid qualifies for Non-GMO Project verification, because all domestic production ferments corn — the full analysis is here .

Request a calcium citrate quote →

Qualification Pack

Calcium Citrate SDS and Documentation

The current SDS, product specification and a lot-specific Certificate of Analysis are available on request, and the full pack ships with every order.

Buyer Questions

Frequently Asked Questions

What is calcium citrate tetrahydrate?

Calcium citrate tetrahydrate is the calcium salt of citric acid carrying four molecules of water of crystallisation, CAS 5785-44-4, E333. It is a white crystalline powder or granule delivering roughly 21% elemental calcium, used for calcium fortification, buffering and firming in food and nutrition manufacturing.

Is calcium citrate soluble in water?

Only sparingly — around 0.1 g per 100 ml at room temperature, compared with sodium and potassium citrate which are freely soluble. In practice it suspends rather than dissolves, so it suits opaque beverages, powders and tablets rather than clear liquid systems.

What is the difference between calcium citrate and calcium carbonate?

Calcium citrate contains less elemental calcium per gram but dissolves without needing stomach acid and avoids carbonate’s chalky mouthfeel. Carbonate is cheaper and more concentrated. Citrate is normally specified for acidic systems, plant-based dairy alternatives and clinical nutrition.

What is the minimum order for bulk calcium citrate?

One pallet — 2,250 lbs — on an LTL basis. A full truckload is 42,500 lbs and carries the lowest landed cost per pound. Send the grade, particle size and annual volume and we return a quote within one business day.

Do you supply FCC and USP grades?

Yes. FCC grade for food and beverage manufacturing, USP grade for supplement, clinical nutrition and pharmaceutical applications. Tell us which pharmacopoeia your specification references and we will match it and send the corresponding certificate.

Is your calcium citrate Non-GMO Project Verified?

Yes. Verification applies to the specific enrolled product, so we supply the current certificate covering the exact grade and source you are buying. Because calcium citrate is made from citric acid, its non-GMO status is inherited from the feedstock — and no US-produced citric acid qualifies, since all domestic production ferments corn.

Related Ingredients

CAS 6132-04-3 · E331

Sodium Citrate Dihydrate

The sodium equivalent — same functions, lower cost, where sodium load is not a constraint.

CAS 77-92-9 · E330

Potassium Citrate Powder

Where the formulation needs potassium rather than sodium or calcium.

CAS 77-92-9 · E330

Citric Acid Anhydrous

The acid every citrate on this site is made from. FCC and USP grades.

Get Bulk Pricing on Calcium Citrate

Send the grade, particle size, pack format and annual volume. We return a quote within one business day, with current lead times and the full documentation pack.