Need HPLC tested Stearyl Glycyrrhetinate with reliable COA benchmark data.

Our dermocosmetics brand recently experienced formulation failures due to inconsistent raw material purity from our previous supplier. As the R&D Director, I am now enforcing a strict vendor qualification process. I am specifically looking for a supplier who can guarantee the purity of their Stearyl Glycyrrhetinate through rigorous HPLC testing. I require a detailed COA (Certificate of Analysis) as a benchmark before approving any sample requests or initiating bulk purchase agreements.