Product categories: Serums & treatments
Retinoids, vitamin C, peptides, acids and other leave-on actives, checked for disclosed strength and studied doses.
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B Supported, with caveats
C E Ferulic ‘dupes’, decoded: what the 2005 study tested, and three cheaper serums read against it
Every ‘C E Ferulic dupe’ leans on one 2005 study: ferulic acid doubled the sun-protection effect of a 15% vitamin C + 1% vitamin…
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C Plausible, thin evidence
‘Botox in a bottle’? What Argireline peptide serums can and can’t do, with three graded
Argireline was designed in a lab to mimic Botox, and its own inventors reported ‘much lower efficacy than the neurotoxin’. Small trials show modest…
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B Supported, with caveats
Retinol vs retinal under $40: five drugstore retinoids, graded
Retinal sits one conversion step closer to the form that acts in skin. We checked five drugstore retinoids for disclosed strength, price per ml…