I am trying to formulate a gentle and hydrating serum for sensitive and damaged skin barrier, and I’m having a few issues.
The first one is that my serum has a sticky feeling. I have read here that Panthenol can cause stickiness and is best used at 1% or lower to avoid this. However, my question is - based on the ingredients (which I will share below) - will reducing the Panthenol alone solve my problem, or are there any other culprits?
The second issue is that I am getting a white, powdery residue upon application. Mainly when the product happens to end up on my eyebrows, but also if I put “too much” of the product on my face. I’ve tentatively eliminated the Niacinamide and Panthenol as suspects (based on a previous, simpler serum I made, which did not cause residue and didn’t include the NAG & Allantoin), so which of the additional ingredients might have caused this? Do I need to reduce percentages for anything?
Distilled Water - 85%
Niacinamide - 5%
dl-Panthenol - 2%
N-Acetyl Glucosamine - 2.5%
Allantoin - 0.5%
Hyaluronic Acid - 1%
Leucidal SF Complete (Preservative) - 4%
Thank you all so much for your time.