Honestly I have no clue. I've gotten them recently

The blue one is hyaluronic acid and I'm not sure if my skin is more moisturized cause of it or it's also cause I started using cerave at the same time. But you need less than three drops, it's very spreadable and so far hasn't broken me out. It was only 2.90€ so I decided to give it a go but I genuinely don't know it's doing anything

The other one is vitamin c serum and I think you have to use this one for awhile before there's any difference. It feels nice against my skin (I have quite sensitive skin) and this one also hasn't broken me out

But it's hard to say if I'd recommend them, they feel nice on my skin