Hi experts out there, I do have a question about retinol retinoid

Instead of concerning about the percentage % of retinol/retinoid itself. 

What form /texture of retinol and retinoid product should be use in skincare routine because retinol and retinoid can come in form of toner, serum, ampoule and cream too. 

Should we use retinol /retinoid only in one of the skincare steps? 

Thanks

retinol and retinoid

Savior for when my skin is breakout. It strengthen skin barrier too which I don&#39;t need to buy additional ampoule for skin routine

Light sunscreen that suit my active outdoor lifestyle

Nothing bad to say about this pocket of Holy grail

Love the packaging so useful while travelling

Ajfazira