So you thought garlic was the wonder drug you were looking for all these drugs? But did anyone ever tell you that it could be poisonous as well. People can develop allergies to any food and even water. Raw cloves of garlic have been used for thousands of years in Asia to treat ailments like high blood pressure, infections and high cholesterol. It is now widely accepted even among the Western medical community as probably having these same health benefits. However, many health professionals warn the high sulphur content in garlic can cause colitis and dermatitis by destroying the natural flora in the gut. High doses of garlic may even prevent blood clotting and interfere with proper thyroid function. So, check with your physician before you start eating garlic day in and day out!