The team from the Fred Hutchinson Cancer Research Center in Seattle warned: ‘There is really no evidence that taking dietary supplements is beneficial to health, and there is increasing evidence that taking high doses is harmful.’
Dr Alan Kristal said the levels of omega-3 linked to the increased cancer risk would be reached by taking just one supplement a day, or three or four meals of fish such as salmon and mackerel each week.
Read more: http://www.dailymail.co.uk/health/article-2359466/Taking-omega-3-fish-oil-supplements-increase-risk-aggressive-prostate-cancer-70.html#ixzz2Z2mlwTIS
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In addition, over-fishing to provide the oils for the supplements is posing environments hazards especially for shark populations which are sourced for the key ingredients. A diets rich in vegetables, fruit, and grains is still a great way to get one's nutritional needs without having to risk possible side affects from ingesting highly processed nutritional aids.