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US Health Secretary Robert F Kennedy Jr. has released plans to loosen restrictions on controversial peptides.

The plans, which were announced in the US Federal Register on Wednesday, say Kennedy would allow compounding pharmacies to prepare six popular peptides, which not been approved by the Food and Drug Administration (FDA).

In an unusual move, the draft came from the office of the health secretary rather than the FDA. After the plan has been officially published later this week, there will be a two-week public comment period.

Unregulated injectable peptides have become popular online. Experts have warned of their lack of clinical trials for humans and unknown long-term effects.

The peptides mentioned in the plan include BPC-157, TB-500, KPV, MOTS-c and Semax. Compounding pharmacies will be able to mix them to create medications.

The BBC has contacted the FDA for comment.

An FDA advisory panel voted in July to loosen restrictions on the six peptides.…