Formulating With Curcumin Extract: Capsules, Tablets, Beverages and Gummies

The Three Properties That Drive Every Decision

• Solubility. Curcuminoids are practically insoluble in water. In a clear liquid, standard curcumin 95% settles out or floats as specks.
• pH stability. Curcumin degrades quickly in neutral and alkaline buffers. Wang and colleagues (1997) showed rapid decomposition at pH 7.2 and above, with ferulic acid and vanillin among the degradation products. Acidic systems are kinder.
• Colour. Curcumin is a colourant (E 100 in the EU). It stains equipment and shifts towards red in alkaline conditions. Plan cleaning and colour expectations early.

Capsules

Hard capsules are the simplest format. Use the fine powder grade, which passes #80 mesh, and check bulk density against your capsule size. A 500 mg fill of curcumin 95% usually needs a size 0 or 00 shell, depending on density and any flow aid.

Keep the blend dry and protected from light. Opaque or coloured shells hide the yellow and reduce light exposure.

Direct-Compression Tablets

Fine curcumin powder flows poorly and can stick to punches. A granulated curcumin grade is made for direct compression on high-speed presses. It flows more evenly and reduces sticking and weight variation. A film coat masks colour and improves shelf appearance.

Beverages, Shots and Clear Liquids

Use a water-dispersible curcumin grade, not standard 95%. Dispersible grades carry the curcuminoids in a matrix that suspends in water. Expect an opaque yellow drink, not a clear one.

Keep the pH acidic where the product allows, and run a stability study in your actual matrix. Declare the curcuminoid content per serving on the specification, because a dispersible grade carries less than 95%.

Gummies and Functional Foods

Gummies combine heat, moisture and often a pectin or gelatin system near neutral pH. Use a dispersible grade and add it as late as the process allows. Check colour after cooking and after 3 months at your storage condition. Curcumin will colour the whole gummy, which suits orange and mango flavours better than red.

Piperine and Other Absorption Partners

Curcumin itself is poorly absorbed. Anand and colleagues (Molecular Pharmaceutics, 2007) summarises the low oral bioavailability and the approaches tried to improve it. Shoba and colleagues (Planta Medica, 1998) reported that 20 mg of piperine raised curcumin exposure in human volunteers.

If you combine the two, our black pepper extract (piperine) is specified separately. The label claims you can make for either combination depend on your market, so take regulatory advice before you write them.

Intake Reference Point

For curcumin used as a food colour, EFSA set an acceptable daily intake of 3 mg per kg body weight in its 2010 re-evaluation of curcumin (E 100). Supplement doses are assessed under supplement rules, which differ by market. See our curcumin regulatory guide.

Choosing the Grade

All grades are listed on our turmeric extract (curcumin 95%) page. For assay questions see curcumin 95: HPLC vs UV.