Today Tonight Test of Vitamins and Nutritional Supplements.

Reporter: Helen Wellings

From A to zinc, a staggering 70 per cent of Australians buy nutritional supplements, spending on average $200 per year: a total of $2.3 billion.

But it is hard to know which to choose, from a mind-blowing 30,000 different types on the market. An extraordinary scientific analysis by a team of Canadian and US biochemists may come to the rescue.

They have thoroughly examined more than 100 leading multivitamins available in Australia and New Zealand, evaluating and comparing their formulations by separating and measuring each ingredient: vitamins, minerals antioxidants and other components.

Dr Lesley Braun, Pharmacist and Naturopath from the National Herbalists…