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Progeline is Trifluoroacetyl Tripeptide-2, used at 0.5 to 2% for the look of a firmer jawline, neck and jowl area. It is the peptide formulators reach for when the concern is slackness rather than lines.
This is a formulation ingredient, not a finished serum. Do not apply it undiluted.
What is in the bottle INCI: Glycerin, Water (Aqua)
4.5
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I like that I am in control of mixing my skincare serum
Judy · September 16, 2026
PROGELINE
Unfortunately I cannot give a review or place an order (I have chosen a few other products) because I cannot get the lid off the bottle. The outer part unscrews and I cannot lift the dropper. So I have not yet tried it! Please advise.