127It should, moreover, be borne in mind that the precautionary principle entails that, where there is uncertainty as to the existence or extent of risks to human health, protective measures may be taken without having to wait until the reality and seriousness of those risks become fully apparent. Where it proves to be impossible to determine with certainty the existence or extent of the alleged risk because the results of studies conducted are inconclusive, but the likelihood of real harm to public health persists should the risk materialise, the precautionary principle justifies the adoption of restrictive measures (judgment of 16 June 2022, SGL Carbon and Others v Commission, C‑65/21 P and C‑73/21 P to C‑75/21 P, EU:C:2022:470, paragraph 96 and the case-law cited).
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