You should always apply your retinol, retinoid product as your last product in the evening as retinol & retinoids are photo-unstable meaning they break down in sunlight & become less effective also during the night when you are sleeping your skin is regenerating & rejuvenating.

The short answer is yes and I shall explain why. The sun produces ultraviolet rays which can be harmful & cause premature aging to the skin in particular UVA & UVB rays are both harmful to your skin when your skin is exposed to direct sunlight with no protection. Prevention is always better than cure, we advise incorporating SPF50 every day into your skincare routine as an absolute must. According to the skincare foundation exposure to UVA UVB rays in winter can be more harmful even on an overcast day as up to 80% of UVA UVB rays can penetrate through clouds. Also, UV radiation increases by 5% with every thousand feet you rise above sea level this means the higher the altitude the greater the risk becomes of photodamage also snow reflects & intensifies sunlight increasing your risk of sun damage.