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The 500 Dalton rule (molecular weight below 500 Da correlates with percutaneous absorption) is a necessary but not sufficient condition, not a guarantee
Definitely a permanent part of my nightly routine
Certain populations may need to exercise caution, particularly those with specific thyroid conditions
doi: 10.1046/J.1365-2745.2002.01466.X 124 RapiejkoPJurkiewiczDPietruszewskaWZielnik-JurkiewiczBWoroJLipiecA
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