YES, SQINTEA active beauty ingredients are heat stable and you will profit from the full beauty benefits when you prepare SQINTEA in hot water.This is the most frequently asked question we hear from consumers and business partners … and it is a good question as there many misunderstandings in this field:When we select our active beauty Ingredients (such as Collagen or OPC) for SQINTEA, it is for us ABSOLUTLY key that the heat stability is tested. Today we have tested successfully all our active ingredients, with third party laboratory tests, on heat stability of up 100° Celsius or more. Some of our ingredients like Vitamin C are coated for heat protection, others are naturally heat resistant up to high temperatures and some have been further studied by scientists.As an example the Thermal denaturation of Collagen Fibres has been tested up to 350 Celsius1 – now that would make for a rather hot cup of tea indeed… 1: https://pubmed.ncbi.nlm.nih.gov/21723833/