Curcumin: The Molecule from Turmeric

Curcumin (1,7-bis(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione) is the main bioactive orange-yellow polyphenol found in Curcuma longa (turmeric). It is a powerful inhibitor of NF-kB and IKK. It is considered one of the most studied natural anti-inflammatory compounds.

Synonyms and Nomenclature

• Diferuloylmethane
• Curcumin I (main form)
• Natural Yellow 3
• CAS: 458-37-7
• Formula: C₂₁H₂₀O₆

Mechanisms of Action

• IKK Inhibition → upstream blockade of NF-kB activation
• COX-2 Inhibition without gastric toxicity
• Direct Antioxidant and Nrf2 activator
• Th17/Treg Modulation → immunomodulatory effect
• Angiogenesis Inhibition via VEGF (interesting in preventive oncology)

The Problem of Bioavailability

Curcumin alone has extremely low oral bioavailability (~1%). Reasons:

• Low water solubility
• Rapid hepatic metabolism (glucuronidation)
• Massive biliary elimination
• Very short plasma half-life

Without a co-factor (piperine, lipids, special formulations), orally consumed curcumin has limited clinical effect. This is why the combination of curcumin + piperine is essential.

The Piperine + Curcumin Synergy (Shoba 1998 reference)

Reference study: Shoba G., Joy D., Joseph T., Majeed M., Rajendran R., Srinivas P.S. Influence of piperine on the pharmacokinetics of curcumin in animals and human volunteers. Planta Medica. 1998;64(4):353-356.

Conclusion: 20 mg of piperine combined with 2g of curcumin multiplies the plasma concentration of curcumin in humans by 20 (2000%). This is the foundational study that justifies the combination of turmeric + black pepper.

Major Clinical Studies

• Lang 2015 (RCT): 3g/day curcumin induces UC remission in 53% vs 0% placebo
• Daily 2016 (meta-analysis): -34% osteoarthritis pain vs placebo
• Panahi 2016: curcumin + piperine ↓ HbA1c and CRP in type 2 diabetics
• Disayavanish 2018: improvement of symptoms in mild/moderate depression

Curcumin in INTI

INTI systematically includes organic turmeric + black pepper to activate the piperine synergy. This is what distinguishes INTI from other ginger drink brands that do not have this combination.

Related Links

• Piperine
• [6]-Gingerol
• NF-kB