[martii94]

Thank you so much for taking the time to advise me.

It’s funny how I thought Vitamin C and the Retinol together could be the main problem and now I’m learning so much about all the rest.

I have no experience with formulating myself, but I’m trying to understand the formula better. This was made for me by a toxicologist to be a hydrating serum. I basically asked for a hydrating serum with Retinol and Hyaluronic Acid and this is what they came up with. 

I now understand that it would be better to use Glycerin and lower the % of HA (I’m not sure why they recommended this 7% of HA).

I was afraid of adding fragrance since I thought that could also cause irritation on the skin? Are there any good ones to use?

Since I want my skincare to be paraben-free I will see if the other preservative ingredients can be added instead of the Lactobacillus ferment.