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Its more expensive and may not suit everyones tolerance

Feb 11 2023;20(4)doi:10.3390/ijerph20043195 Balasubramanian A, Kohn TP, Santiago JE, et al

In one DAXI study, 95.7% of participants were somewhat satisfied, satisfied, or very satisfied with their results after four weeks, with the highest number of participants describing themselves as very satisfied

Semax is a good example because "how long it lasts" can mean biological effect duration, powder stability, or reconstituted-vial stability
