The papery outer skin concentrated into one of nature's richest quercetin sources
Allium cepa — the common onion — stores its highest concentration of flavonols not in the edible bulb but in the dry outer skin (peel). Those papery brown layers are exceptionally dense in quercetin, its glycosides and related flavonols, making onion peel one of the richest natural quercetin sources available to formulators.
SV Botanica supplies Onion Peel Extract as a 10:1 native concentrate of the outer dry peel, processed at our GMP-certified facility in India and screened by ICP-OES for heavy metals with a full microbial panel before release. The native grade preserves the full flavonol matrix; where a defined marker is required, quercetin-standardised grades (typically 5%–40% by HPLC) are produced on request.
Quercetin's standout property is its antioxidant and flavonol activity — long studied for cardiovascular, anti-inflammatory and metabolic support. That positions onion peel extract at the centre of antioxidant supplements, natural quercetin blends, and clean-label functional formulations. Water-soluble and organic-certified material are available on request.
We supply supplement brands, functional-food makers and Ayurvedic manufacturers across Europe, the USA, the Middle East and Southeast Asia. Every batch is backed by a Certificate of Analysis and full export documentation — start a conversation with our team via the quote request form. For a quercetin-standardised onion bulb material, see our Onion Extract.
