16
The safety profile of chemical filters is still under
investigation. In a study exposing healthy volunteers to
whole-body topical application of 2 mg/cm2
of a sunscreen
formulation (wt/wt) containing benzophenone-3 (BP-3),
octyl-methoxycinnamate, and 3-(4-metylbenzylidene)
camphor (4-MBC),17
the mean concentrations in plasma
were surprisingly higher at 96 hours than at 24 hours
for 4-MBC and octyl-methoxycinnamate in men and
for BP-3 and 4-MBC in women. However, the reality
is that the amount of sunscreen normally applied by users is about 50% of the dose used in that study, and,
although these substances have deleterious effects,
none have been demonstrated in conditions of normal
use. The nonpenetrating sunscreens that have recently
appeared on the market have chemical characteristics
that confine them to the upper stratum corneum
where the photoprotective molecules act. They can
therefore block solar radiation from reaching the
dermis while preventing the sunscreen from entering
the bloodstream.18
16
The safety profile of chemical filters is still under
investigation. In a study exposing healthy volunteers to
whole-body topical application of 2 mg/cm2
of a sunscreen
formulation (wt/wt) containing benzophenone-3 (BP-3),
octyl-methoxycinnamate, and 3-(4-metylbenzylidene)
camphor (4-MBC),17
the mean concentrations in plasma
were surprisingly higher at 96 hours than at 24 hours
for 4-MBC and octyl-methoxycinnamate in men and
for BP-3 and 4-MBC in women. However, the reality
is that the amount of sunscreen normally applied by users is about 50% of the dose used in that study, and,
although these substances have deleterious effects,
none have been demonstrated in conditions of normal
use. The nonpenetrating sunscreens that have recently
appeared on the market have chemical characteristics
that confine them to the upper stratum corneum
where the photoprotective molecules act. They can
therefore block solar radiation from reaching the
dermis while preventing the sunscreen from entering
the bloodstream.18
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