Other Topical Photoprotective Agents
Dihydroxyacetone
Dihydroxyacetone is the substance most commonly used
in sunless tanning products. It has also been shown
to have a weak photoprotective effect, providing an
SPF of between 1.5 and 3.5.72 This photoprotection
depends on the concentration used and the number of
applications (for example, 20% dihydroxyacetone applied
once or a 5% solution applied 3 times will provide the same
photoprotection, an SPF of 1.6).73 The greatest advantage
of dihydroxyacetone is that its photoprotective effect can
last 1 to 2 weeks.