Piperine: The Key Molecule in Black Pepper

Piperine is the main alkaloid of Piper nigrum (black pepper). Known since 1819, it is responsible for black pepper's pungent taste and – a more recent discovery – increases curcumin's bioavailability by 20 times. It is one of the most powerful synergistic compounds in phytotherapy.

Chemical Identification

• IUPAC Name: (E,E)-1-piperoyl-piperidine
• Formula: C₁₇H₁₉NO₃
• Molar mass: 285.3 g/mol
• CAS: 94-62-2
• Presence: 5-9% of dried black pepper

Mechanisms of Action

1. Inhibition of Hepatic Glucuronidation

Main mechanism: piperine inhibits hepatic UDP-glucuronosyltransferase. Consequence: less conjugation → less biliary elimination → longer systemic presence of the molecules concerned (curcumin, but also β-carotene, certain medications).

2. Inhibition of Intestinal P-glycoprotein

P-gp is an efflux transporter that re-exports certain molecules from the enterocyte to the intestinal lumen. Piperine inhibits it → better intestinal absorption.

3. Activation of TRPV1 Receptors

"Pungent" effect via TRPV1 (capsaicin channel). Slight vasodilatory effect topically.

The Shoba 1998 Study (Absolute Reference)

Reference: Shoba G, Joy D, Joseph T, Majeed M, Rajendran R, Srinivas PS. Influence of piperine on the pharmacokinetics of curcumin in animals and human volunteers. Planta Medica. 1998 May;64(4):353-6.

Conclusions:

• Healthy human volunteers (n=10)
• 2g curcumin alone → almost zero bioavailability
• 2g curcumin + 20mg piperine → +2000% (×20) plasma concentration
• Effect without observed toxicity

This study has become the foundation for all modern curcumin supplementation.

Other Piperine Synergies

• ↑ bioavailability of β-carotene (provitamin A)
• ↑ bioavailability of resveratrol
• ↑ bioavailability of EGCG (green tea)
• ↑ bioavailability of vitamin B6

Piperine in INTI

INTI systematically includes organic black pepper to activate the piperine synergy. Note: cayenne (capsaicin) and piperine are two distinct molecules, but act synergistically on TRPV1.

Safety and Precautions

Piperine can alter the bioavailability of certain medications by inhibiting glucuronidation. Precaution:

• Phenytoin (potentiated)
• Theophylline (potentiated)
• Propranolol (potentiated)

Consult a doctor if taking relevant medication.

Related Links

• Curcumin
• [6]-Gingerol