Cosmetics Formulation Development

I want to ask the quantity of Retinol located at Encapsulated Retinol that 2% of Encapsulated Retinol Yes Retinol a How many %? I'm quite confused with the units shown on the web page. "Concentration of Vitamin A : 65K.IU/g[/i ] What does this mean? I'm confused how to convert volume of Vitamin A in grams. Thank you.

In Encapsulated Retinol 1 gram contains a concentration of Vitamin A 65K.IU, 1-2% is the usage rate. Encapsulated Retinol in the formula, for example in the 100g formula, use Encapsulated Retinol 2 g Other ingredients another 98 grams

Hello Vitamin A 65KIU/g = 2% IU (international unit) is the unit of concentration of Vitamin, but if converted to %, the concentration will be 2%.