While AHAs have their benefits, such as cheaper and slightly more effective (depending on the formulation, of course), PHAs (both actobionic and gluconolactone) are way less sensitizing than glycolic acid.
A comparative study (third page) of 6% lactobionic acid vs. glycolic acid in both gel and emulsion formulations showed that lactobionic acid resulted in improved skin benefits as compared with corresponding glycolic acid formulations, however, it causes much less skin irritation and barrier impairment, making it more suiting for sensitive skins.
The more gentle effect of lactobionic acid can be explained by its larger molecular size and its bond to a sugar molecule, resulting in a slower skin penetration rate and a higher moisture affinity.
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