This one is very sticky after application. I did notice some crystallization of the product around the rim after a week, so you need to keep the bottle clean. (Yes more reasons why thick liquid should just not be in droppers) Of course haven’t tested it long enough to see how this holds up, but bottle has no PAO info.

The texture and consistency is pretty much just like the HA serum, but ingredients wise they aren’t the same (but this one has HA in it, like I said, everything has HA). This didnt irritate my skin

Dr Song - hoarderbeauty review for Vitamin C Serum

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