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However, heavy metal ions affect C

Side effects are generally mild and may include temporary redness or swelling at the injection site, nausea, or mild headaches

Octocrylene's safety profile is generally quite good, though a review study in Contact Dermatitis reports an "increasing number of patients with photo contact allergy to octocrylene." Mainly adults with ketoprofen-sensitivity and children with sensitive skin are affected, so if you have a small kid, it is probably better to use octocrylene-free sunscreens

2009 Apr 30;62(2):218-29

Or are there some specific ingredients that must be avoided and not necessarily all chemical sunscreens