My right hon. Friend is exactly right, for two reasons. First, many fitness supplements and other supplements work through the brain. There is no doubt about that—growth hormone-related ones do, and benign things like sage oil do. The other problem she faces is in the definition in the explanatory notes, which says that a psychoactive substance is a substance that causes
“a range of effects including, but not limited to hallucinations; changes in alertness, perception of time and space, mood or empathy with others; and drowsiness.”
All of those could apply to everything from antihistamines to, as I say, something as benign as sage oil. The problem is that if we are not careful we will end up with bad law that will undermine the status of people such as her constituent.