If you make NO CALIMS on the product, it will be governed by the food standards people.
The second you make claims on bodily effects/changes etc that is deemed as 'Therapeutic' regardless of the ingredient (Food type ingredient like Creatine or a pharmaceutical compound). TGA approval costs from memory about 10k PER INGREDIENT in the product!
With that said, the TGA is really wanting to make ANY ingredient in a capsule classed as Therapeutic, which is rubbish. So there can be headaches.