The same base formulation has been identified in 20 sunscreens that Australia’s medicines regulator has warned are unlikely to have a sun protection factor (SPF) rating of more than 21, with some products as low as SPF 4.

The Therapeutic Goods Administration (TGA) on Tuesday identified sunscreens sold by 17 different companies using a base formulation made by manufacturer Wild Child Laboratories as likely to fall far short of their sun protection factor claims.

The TGA published the list of sunscreens as part of an investigation it launched in June after the consumer advocacy group Choice released its own testing that found several leading Australian sunscreens didn’t provide the protection that they claimed. Can I trust my sunscreen? Choice test results have created uncertainty over

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