Yes, many people use sunscreen alongside collagen based products in their skincare routine. For example, a collagen serum or cream may be used first, followed by sunscreen during the daytime routine.

Yes, many people still apply sunscreen indoors because sunlight can enter through windows and daily exposure can still occur during short periods outside.

Moisturiser is applied first because it hydrates the skin. Sunscreen is usually applied after moisturiser as the final skincare step before makeup or stepping outdoors.