Collagen

What it does

Topical collagen is too large to replace what the skin loses — what it does is form a hydrating film that leaves skin looking plumper and smoother in the morning. That is worth having, as long as nobody pretends it is more.

How to use it

Night masks and creams, two or three times a week.

Pairs well with

• Hyaluronic Acid Holds water in the upper layers so the skin looks plumper by morning. Read more
• Peptide Complex Signals the skin to firm; slow, cumulative, worth the patience. Read more