Where to buy ISO certified cosmetic grade Stearyl Glycyrrhetinate powder?

I am the procurement manager for a mid-to-large scale skincare manufacturing company based in Europe. We are launching a new line of hypoallergenic and soothing lotions for sensitive skin. I need to source bulk quantities of high-purity active ingredients directly from a reliable manufacturer rather than a middleman. It is strictly required that the supplier possesses verified ISO certifications to pass our internal quality audits and ensure a stable, long-term supply chain for our commercial production.