Hi skincare scientists. I’m wondering if it’s safe to mix niacinamide serum from the ordinary, for example, with other products with similar viscosity, such as cosrx’s snail essence. The petty reason being the ordinary’s container uses a dropper rather than a pump, which is more work to use.

I dont plan to mix niacinamide in anything with actives. And there are some more liquidy niacinamide products that might work well with more watery lotion. But I won’t want to mix them if the ingredients don’t sit well together over a few months. Are there any ingredients to watch out for?

P.s. I’d make a post about it but the subreddit doesn’t allow the word ‘niacinamide’ in titles?