An AFL survey has revealed that there have been several issues with most clubs’ use of supplements, as the league seeks to formalise changes to its anti-doping code.

The survey reveals:

- Players from nine AFL clubs have independently sourced supplements.

- 12 clubs conducted programs with medium or high levels of supplements

- These clubs lacked "a single point of accountability"

- The definition of supplements was not satisfactory

- The selection process of support personnel was flawed.

Supplement use will be curtailed.

AFL medical officer Dr Peter Harcourt told a group of more than 200 doctors, physiotherapists and sports scientists of the findings during grand final week.