This is my second retinol product (the first was Tuber). I've used it up, but I haven't noticed any irritation or skin problems. Since using it, I've noticed an improvement in the pores on my cheeks, and it seems to have refined the skin's texture and made it firmer. I'm planning to buy this for a family member who is new to retinol. I want to try different products, so I plan to try a different retinol product next, but this one is reliable and cost-effective, so I'll likely return!