Why does vitamin c have to be applied in the evening?

[annie71]

On the internet I read differ recommendations for when it is best to apply vitamin c.  Seem say via c should be applied under sunscreen in the morning, whilst you say it is best applied in the evening.  Please can you tell me the rationale behind this?

Also when is it best to apply copper peptides, day or evening? Many thanks

[SarahVaughter]

Your questions are answered here:

https://http://forums.owndoc.com/dermarolling-microneedling/best-skin-care-routine/

You can apply vit. C in the morning if you prefer, it is not really crucially important whether you apply it in the morning or in the evening.
For the reasons I gave, evening application is more optimal but it is not fundamentally important.

I am aware that some people advise vit. C to be applied in the morning, but unless they have better arguments than my arguments, I would ignore that advice.
(I removed your "but why do some disagree with you"? posting becasue such postings are against the rules here. If you want to know why some people disagree with my dermaneedling advice, you'd have to ask them, not me.)