Altruist SPF - on bare skin, or after serum/moisturiser?

[Twatterati]

Does anyone know please?

Do I apply it to clean, bare skin so it's the 'first layer', or does it go on after serum and moisturiser?

It's an excellent SPF, very moisturising and makeup goes on well afterwards. I'm just never sure with SPFs if they are the first or final layer! So much conflicting advice on t'internet too (and this thread may well be the same, haha).

Thank you

Final layer.

No one knows because no one has done any research for this particular question. If you want to be absolutely safe you apply on bare skin and nothing else over the top, just SPF. Otherwise you use it as the last step of skincare and allow 30mins to 'set' so you don't disrupt the protective shield it forms when applying makeup. The 30 mins will vary per sunscreen some set quicker than other.