Are the benefits of glycerin proven? I find a lot of people recommend mixing it with water and/or lemon juice.

I am 45 and started using retinoid 0.0025 12 days ago for wrinkles. I have very minor flaking and some extra acne but otherwise doing well. I still exfoliate with baking soda like I have for years and it leaves my skin smooth and does not irritate, but I have read that one can make a moisturizer that will make the color of the face more even from glycerin, water and/or lemon juice. Is that true and is it recommended with retinoid cream? If so, when should I apply it (I use sunscreen in the day)?

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