Caffeine
Caffeine constricts blood vessels and has some antioxidant activity, which gives it a modest, temporary effect on oiliness and puffiness — real, but smaller than the marketing around eye creams and depuffing serums usually suggests.
How it works
A methylxanthine with vasoconstrictive and antioxidant properties; topical evidence for reducing localized sebum and puffiness exists but is more modest than marketing claims often suggest.
In practice, it's worth having reasonable expectations for — a mattifying assist alongside a real oil-control active like niacinamide or zinc PCA, not a replacement for one.
How to introduce it
Wait about 5 minutes before the next step. Judging Caffeine before week 6 means judging it before it's had time to actually work — most of what reads as "this isn't doing anything" in the first couple of weeks is just too early to tell.
- Kaolin clay formats are rinse-off — not left on overnight.
Who should be careful
Caffeine's safety rating is the lowest tier tracked here — well tolerated by most skin types, including sensitive skin, without a slow introduction.
Common in these product forms
Among the products Skinzy tracks in India that contain Caffeine, it most often shows up as a serum.
Questions people ask
A mild, temporary oil-control and depuffing ingredient — real effect, but more modest than most marketing claims.
Most people see a fair result around 6 weeks of consistent use — judging earlier usually means judging too soon.
In the morning. Caffeine is intended for AM use.
Research
Selected studies and reviews on Caffeine. Each link opens the abstract on PubMed. This is background reading, not a substitute for advice from a dermatologist.
- Caffeine's mechanisms of action and its cosmetic use.Herman A, Herman AP Skin Pharmacol Physiol, 2013 · PMID 23075568