Good barrier supporting serum?

I started using tazarotene a month a ago and it's been going good so far. I have been using Purito unscented serum as my main serum in the daytime, but wanted to try something even more barrier supporting. I wanted to buy Numbuzin protein serum (No. 2), but I've seen it's being discontinued.

That being said, do you have any recommendations for a good serum that will protect my barrier?