Tretinoin is the best thing you can use on your face. It is prescription only but in the UK you can subscribe to either Skin and Me or Dermatica.
I have used both and much prefer Dermatica. For some reason the Skin & Me really irritated my skin. Also you have to build up to a decent % for it to make a real difference and Dermatica make that quicker without being too quick. You should start slowly, twice a week for a couple of weeks then each week use it an extra night. One thing you must do is use spf each day otherwise it’s pointless using tret for the benefits. Also you must keep your skin moisturised as for some it can be a bit drying but I haven’t experienced that.
I used to use retinol but didn’t see a difference but I have been using tret for almost a year now and the difference in my skin is noticeable, it has never looked so good. It is brighter, more even and my sun spots and fine lines have honestly vanished. My skin looks so plump and smooth now. I used to spend a fortune on skincare products promising the miracles but nothing worked until I used tret. You have to sign up to a monthly subscription which you can pause or cancel anytime so you are not tied in. At first I thought it was a bit pricey but when I added up all the other stuff I was using it actually worked out cheaper. You can buy other products from them and I really rate their cleanser and moisturiser too.
If you do decide use it keep your routine simple, at night just cleanse, treat then moisturise and in the mornings cleanse, serum if you want it, moisturise and spf.
To start with Dermatica you fill out a questionnaire on their website and upload some photos of your skin and a pharmacist looks at them and prescribes you a formula that will suit your skin. If you are ever not happy you can contact them to tell them what you are wanting to achieve and they will adjust it for you. They are actually really helpful.
If you do want to use it I have a code rhat gets you the first month really cheap. It does give me a credit for referring you too but you get it so much cheaper. Please feel free to use it at the checkout. The code is 5EW47R
Let me know how you get on and if you do have any questions about it feel free to message me, I know I had loads of questions when I started, so if I can help in any way just shout.