Retinol for beginners

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Can anyone help me?

I'm so confused with all the options

I'm
30.

I've been on Roaccutane as a teen and retinol is a varient of that.

I've had a couple of issues with retinol previously!

Charlotte Tilbury night cream contains retinol and I didn't know this. I used it liberally and then went for a wax.. let's not talk about that!

I've got the ordinary 0.5 retinol is that a good start?

I built up through the ordinary strengths, can't remember the exact numbers, used one till it was finished and then got the next one up. Don't seem to have had any problems with this approach.