In July, someone on a skincare forum wrote out the ingredients they had been told to care about, in the order they arrived. Collagen, retinol, retinal, PDRN, NAD+, peptides, Volufiline, and now EGF.
The list was the point
The post drew around 90 upvotes and 49 comments at the time of writing, at a 97 per cent upvote ratio. Almost none of the discussion was about whether any single ingredient worked.
The writer's own phrase for it was ingredient fatigue. The replies agreed, then argued about the cause.
The most-supported explanations were structural rather than chemical. One reply put it this way: they are not inventing a new thing, they are selling a new story.
Another answered the question the thread had not quite asked. Tretinoin, vitamin C, sunscreen, ceramides, maybe niacinamide.
Skin runs on a slower clock
A routine change is measured in weeks. Stella holds an observation window of six to eight weeks before a read lands on a single product.
The list above runs to eight ingredients. Several were replaced in public before there was time to watch what any of them did.
That is the mismatch. The cycle is not moving at the speed of evidence, and it is not moving at the speed of skin.
Slow change is hard to notice, even when you are watching for it
This part is documented. Simons, Franconeri and Reimer found that people miss large changes with no visual interruption at all, provided the change is slow enough — and in one experiment noticed more when the view was briefly interrupted than when it was not (Simons et al., Perception 2000;29(10):1143-54).
