translate English to German: Suntan creams with physical filtration consisting of mineral pigments (generally from makers of natural cosmetics) do provide immediate protection, however, some scientists warn of possible risks from repeated applications of nano-sized particles, as they can penetrate deep into the body and accumulate.
Die üblichen Sonnencremes mit chemischen Zusätzen haben zudem eine lästige Startzeit (und sind mindestens 20 - 30 Minuten vor dem Sonnenbad anzuwenden).