Prosposol (Propolis extract)

Propolis extract (Prosposol) is a resinous bee-derived compound rich in polyphenols, particularly caffeic acid phenethyl ester (CAPE) and flavonoids like chrysin and galangin, which drive its biological activity. These bioactives inhibit NF-κB signaling and scavenge reactive oxygen species, producing measurable anti-inflammatory and antioxidant effects validated in human clinical trials.

Origin & History

Prosposol (propolis extract) is a resinous mixture collected by honeybees from tree buds, sap flows, and other botanical sources, then combined with bee saliva and wax to seal and protect the hive. The extract is typically produced using ethanol or other solvents to create standardized extracts containing bioactive compounds, with Brazilian green propolis and European propolis being among the most studied variants.

Historical & Cultural Context

Propolis has been used in traditional medicine systems, with modern pre-clinical and clinical studies investigating its therapeutic benefits being motivated by these historical uses. However, specific details about which traditional medicine systems employed propolis or the duration of historical use are not well documented in current research.

Health Benefits

• Reduces inflammatory markers (IL-6, TNF-α, CRP) and increases antioxidant capacity based on a meta-analysis of 27 RCTs with 1,539 participants
• Supports metabolic health by reducing aspartate aminotransferase (AST) levels according to meta-analytical evidence
• May help with cancer treatment-related toxicities including oral mucositis and dysphagia following radiotherapy (clinical trial evidence)
• Shows promise for treating diabetic foot ulcers when applied topically as 5% ointment (clinical trial evidence)
• Demonstrates anti-parasitic effects against cutaneous leishmaniasis in both in vitro and animal studies

How It Works

Propolis polyphenols, particularly CAPE and pinocembrin, suppress NF-κB nuclear translocation, thereby downregulating transcription of pro-inflammatory cytokines including IL-6, IL-1β, and TNF-α. Flavonoid constituents such as galangin and chrysin inhibit cyclooxygenase (COX) and lipoxygenase (LOX) enzymes, reducing prostaglandin and leukotriene synthesis. Additionally, propolis upregulates endogenous antioxidant enzymes including superoxide dismutase (SOD) and catalase by activating the Nrf2-Keap1 pathway, enhancing cellular redox homeostasis.

Scientific Research

A 2024 meta-analysis of 27 randomized controlled trials (1,539 participants) found that propolis supplementation significantly reduced inflammatory markers and increased antioxidant capacity, with stronger effects in trials lasting less than 12 weeks. Clinical trials have investigated Brazilian organic propolis extract for radiotherapy-related toxicities in head and neck cancer patients, while other studies examined standardized propolis (EPP-AF®) for leishmaniasis treatment and 5% propolis ointment for diabetic foot ulcers.

Clinical Summary

A meta-analysis of 27 randomized controlled trials encompassing 1,539 participants demonstrated that propolis supplementation significantly reduced circulating inflammatory markers IL-6, TNF-α, and CRP while improving total antioxidant capacity. The same body of evidence showed reductions in aspartate aminotransferase (AST), suggesting hepatoprotective benefits relevant to metabolic health. Preliminary clinical data also indicate potential adjunctive roles in cancer-related symptom management, though this evidence remains early-stage and insufficiently powered to draw firm conclusions. Overall evidence quality is moderate; most trials are short-term and heterogeneous in propolis composition and dosage, warranting cautious interpretation.

Nutritional Profile

Prosposol is a standardized propolis extract delivered typically as an oral spray or liquid formulation. It is not a significant source of macronutrients (protein, fat, carbohydrates) or calories, as it is administered in small therapeutic doses. **Key Bioactive Compounds:** • **Flavonoids** (primary active constituents): including pinocembrin (~1-3% of dry extract), chrysin (~0.5-2%), galangin (~0.5-2%), apigenin, kaempferol, and quercetin — these are responsible for much of the anti-inflammatory and antioxidant activity. • **Phenolic acids and esters:** caffeic acid phenethyl ester (CAPE, ~0.5-2%), p-coumaric acid, ferulic acid, and cinnamic acid derivatives — CAPE is considered one of the most pharmacologically potent constituents, contributing to NF-κB inhibition and TNF-α/IL-6 suppression. • **Artepillin C** (3,5-diprenyl-4-hydroxycinnamic acid): present predominantly in Brazilian green propolis-derived extracts (~3-5% of dry extract), with notable anticancer and immunomodulatory properties. • **Terpenoids and volatile compounds:** including β-eudesmol, nerolidol, and farnesol (~0.5-1%). • **Organic acids:** benzoic acid, sorbic acid. • **Trace minerals:** small amounts of zinc (~0.02-0.05 mg per dose), iron, calcium, manganese, and magnesium derived from the raw propolis matrix, though not at nutritionally significant levels. • **Vitamins:** trace amounts of B-complex vitamins (B1, B2, B6) and vitamin E (tocopherols), again not at nutritionally relevant doses. • **Polysaccharides and waxes:** present in the crude extract but partially removed during standardized extraction; residual amounts may contribute to mild immunostimulatory effects. **Approximate concentration in typical dose (2-3 sprays or ~0.1-0.3 mL):** total flavonoid content ~5-15 mg expressed as galangin equivalents; total phenolic content ~10-30 mg expressed as gallic acid equivalents, depending on formulation strength (commonly standardized to 5-11% w/v propolis dry extract). **Bioavailability notes:** Flavonoids from propolis extracts generally have low oral bioavailability (5-10%) due to extensive first-pass metabolism and glucuronidation, though the alcohol/propylene glycol-based liquid delivery system in Prosposol may enhance mucosal absorption. CAPE shows moderate absorption with peak plasma levels at ~1-2 hours. Artepillin C has relatively better bioavailability (~15-20%) compared to other propolis flavonoids. The spray/oral mucosal delivery format may bypass some hepatic first-pass metabolism for locally acting compounds, improving effective concentration at oropharyngeal sites.

Preparation & Dosage

Clinical studies have used propolis supplementation at 1,000 mg daily, though specific dose-response relationships are not well established. Treatment durations in clinical trials have ranged from less than 12 weeks to 12 weeks or longer. Topical applications have used 5% propolis ointment for diabetic foot ulcers. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Vitamin C, Quercetin, Zinc, Elderberry, Echinacea

Safety & Interactions

Propolis is generally well tolerated at typical supplemental doses of 400–1,500 mg/day, but allergic reactions—ranging from contact dermatitis to rare anaphylaxis—are documented, particularly in individuals allergic to bee products, pollen, or salicylates. It may potentiate anticoagulant medications such as warfarin due to coumarin-like constituents, and caution is advised when co-administering with immunosuppressants given its immune-modulating activity. Propolis may inhibit cytochrome P450 enzymes (notably CYP3A4 and CYP2C9), potentially altering plasma levels of co-administered drugs metabolized by these pathways. Safety data in pregnancy and lactation are insufficient; use is not recommended in these populations without physician supervision.