Robert F Kennedy Jr, the US health secretary, is a chaotic person, but his Make America Healthy Again (Maha) agenda tends to follow a predictable logic. Large-scale, mandatory public health interventions – such as childhood vaccine requirements – are generally treated with suspicion and undermined. Personal choice – to drink unpasteurised milk, for example – is to be unleashed, and unburdened by regulation. In theory, Maha promises freedom and autonomy; in practice it tends to replace the precautionary principle with exhortations for individuals to “do your own research”, and sidelines scientific expertise in favour of “wellness” hucksters and profiteers.

This is particularly obvious in Mr Kennedy’s recent claims that he will open up the sale of “about 14” injectable peptide drugs to the public. Peptides are molecules often used by our bodies for........

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