Procyanidin B2

Proanthocyanidin dimer

Function

Procyanidin B2 is a dimeric flavanol phytochemical composed primarily of epicatechin units. It is found in cocoa, apples, grapes, cranberries, cinnamon, tea, and numerous fruits rich in condensed tannins and flavanols.

Procyanidin B2 functions mainly as a polyphenolic antioxidant involved in oxidative stress modulation, endothelial signaling, inflammatory pathway interactions, and vascular redox regulation. Research has examined its effects on nitric oxide systems, mitochondrial pathways, lipid oxidation, and antioxidant enzyme responses.

It is one of the major procyanidin dimers present in cocoa and many fruit skins and seeds.

Production

Plants synthesize Procyanidin B2 through flavonoid biosynthesis pathways involving condensation of flavanol monomers such as epicatechin. These oligomeric tannins accumulate in protective plant tissues including bark, skins, and seeds.

Growing conditions, storage, processing, and fermentation influence concentrations. Cocoa beans and apples are among the most recognized dietary sources.

After ingestion, Procyanidin B2 undergoes limited direct absorption and substantial microbial metabolism within the intestine. Gut microbiota convert larger flavanol oligomers into smaller phenolic metabolites.

Regulation

Procyanidin B2 activity is regulated by digestive transformation, microbiome composition, food matrix interactions, and conjugation pathways. Processing conditions strongly influence exposure.

Research suggests Procyanidin B2 may interact with oxidative stress pathways, endothelial nitric oxide signaling, inflammatory mediators, and vascular systems. Effects depend on concentration, metabolism, and tissue distribution.

Dietary intake from cocoa, berries, apples, grapes, and tea provides Procyanidin B2 together with catechins, fiber, minerals, and additional polyphenols that collectively support antioxidant and vascular signaling diversity.

Chemical Identity

Molecular Formula: C30H26O12
Molar Mass: 578.520 g/mol
PubChem CID: 122738

Key Biological Functions

  • Supports endothelial NO signaling; antioxidant buffering.

Key Foods / Plant Sources

Top Foods
  • Cocoa; apples; grapes; berries
Additional Sources
  • Fruit skin + seed polyphenols.

Bioavailability & Inhibitors

Inhibitor / Factor Effect on Activity / Absorption
Bioavailability depends on microbiome hydrolysis.
Note: Factors relate to activation and cellular signaling context. Educational only.

Cellular Pathways Involved

  • NO/endothelial pathways.

Low Intake / Context

  • Not a classical deficiency.

Linked Cancers

  • Cardiovascular health and cognitive circulation (diet context)

Linked Ailments / Conditions

  • Vascular inflammation; oxidative stress

SUMMARY OF EFFECTS ON THE BODY

  • Immune: defense
  • Cardiovascular: endothelial
  • Digestive: polyphenol breakdown
  • Skin: microvascular
  • Cellular: stability