Curcumin

Grades and forms of curcumin powder

Curcumin is the principal yellow curcuminoid of turmeric (Curcuma longa) rhizome. Supplement manufacturers buy curcumin powder as a turmeric extract standardised to curcumin or to total curcuminoids, or as formulated grades for specific formats. In the EU it has two regulatory roles: the food colour E100, and an ingredient in its own right that is governed largely by national rules.

Standardised extracts contain curcumin together with demethoxycurcumin and bisdemethoxycurcumin. The specification states whether the assay covers curcumin alone or total curcuminoids, and the analytical method used. That basis decides how you word and calculate the label claim, so confirm it before you fix the formula.

The physical forms differ mainly in how they behave in production:

• Fine extract powder: for capsules, tablets and dry blends where water dispersibility does not matter.
• Granulated grades: for direct compression when the fine powder flows or compresses poorly.
• Water-dispersible formulations: curcumin combined with carriers, emulsifiers or encapsulating agents for drink powders. Their curcumin content is lower than the plain extract, and every carrier must itself be permitted.

The choice comes down to format, assay basis, the carrier system and the purity criteria on the specification. Curcumin sits within the polyphenols and flavonoids range, close to other turmeric-derived botanical extracts.

EU regulatory status

Curcumin is neither a vitamin nor a mineral, so Annexes I and II of Directive 2002/46/EC do not list it. The Directive’s definition of food supplements still covers products containing other substances. Rules on their composition and quantities are set mainly at national level.

As a colour, curcumin is E100 under Regulation (EC) No 1333/2008. Its specification and purity criteria are laid down in Regulation (EU) No 231/2012; check the current text for the extraction solvents it permits. When curcumin colours a tablet coating, capsule shell or the product itself, it is a food additive. The conditions of use in Annex II of Regulation 1333/2008 for food supplements (food category 17) then apply.

Conventional turmeric extracts are widely marketed in the EU. Grades that change the composition, use new carriers or rely on a new production process may fall under the novel food rules of Regulation (EU) 2015/2283. Check the specific grade against the Union list and our novel food guide.

Several member states regulate botanical preparations through national lists, notification procedures or specific conditions of use. Some may set particular conditions for turmeric and curcumin preparations. Confirm the position with the competent authority of each market before launch.

Any claim on the finished product must comply with Regulation (EC) No 1924/2006. Check the EU Register of nutrition and health claims and our health claims guide.

Formulation notes

Solubility. Curcumin is practically insoluble in water and dissolves in ethanol and acetone. The plain powder is hydrophobic and tends to float and clump in drinks. Use a water-dispersible grade for powders and sports nutrition mixed by the consumer.

Stability. Curcumin is sensitive to light. In neutral to alkaline aqueous systems it degrades and its colour shifts towards red-brown. Use light-protective packaging and opaque shells, and keep wet systems acidic where the format allows. The overage calculator helps when stability data call for an overage.

Colour and cleaning. The intense yellow colour transfers to other ingredients and stains seals, belts and filling equipment. Plan changeover cleaning and sequence curcumin batches accordingly.

By format:

• Capsules: opaque HPMC or gelatin shells hide the colour. Fine extract powders may need a flow aid such as silicon dioxide.
• Tablets: curcumin is bitter and earthy. A coating masks taste and colour and protects against light.
• Softgels: curcumin is usually filled as a suspension in an oil carrier rather than as a solution.

Label-claim arithmetic. For a declared amount of curcumin, extract mass per serving = declared curcumin (mg) × 100 ÷ assay (%). Use the assay and its basis from the certificate of analysis, then add any overage. SoleChem sends the specification sheet and certificate of analysis with its quote, so state the assay basis and format you need in the quote form.