Canterbury University psychology professor Julia Rucklidge says new regulations on health products could mean people won't be able to access products that can help their mental health.

Professor Rucklidge's studies have shown how micronutrients could be an alternative to traditional medication for Attention Deficit Hyperactivity Disorder (ADHD).

The Ministry of Health is currently working on a list of approved substances which will not need specific approvals but Julia Rucklidge says a lot of products will become inaccessible as nutrients will be banned for no good reason.

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