The main conclusion to be drawn from the efforts of more than 130 research projects, covering a period of more than 25 years of research, and involving more than 500 independent research groups, is that biotechnology, and in particular GMOs, are not per se more risky than e.g. conventional plant breeding technologies.
Royal Society of Medicine
Foods derived from GM crops have been consumed by hundreds of millions of people across the world for more than 15 years, with no reported ill effects (or legal cases related to human health), despite many of the consumers coming from that most litigious of countries, the USA.
World Health Organization
GM foods currently available on the international market have passed risk assessments and are not likely to present risks for human health. In addition, no effects on human health have been shown as a result of the consumption of such foods by the general population in the countries where they have been approved.
The International Council for Science
Currently available genetically modified foods — and foods derived from them — have been judged safe to eat, and the methods used to test them have been deemed appropriate.
The American Association for the Advancement of Science
The science is quite clear: crop improvement by the modern molecular techniques of biotechnology is safe.
American Medical Association (AMA)