Over 350 products containing nanomaterials are now on the market, with silver as the most common ingredient by far.

ECONOMIST: The dulling of nanotech��s silver lining

The condition is triggered by an intolerance to gluten, a protein found in wheat, barley and rye - and therefore a common ingredient in many processed foods.

BBC: NHS 'paid ?17 for gluten-free pizza base'

Combination hydrocodone drugs usually also contain acetaminophen, the active ingredient in common pain products such as Tylenol.

MSN: FDA staff says Zogenix painkiller has abuse risks

Last year, the U.S. Department of Veterans Affairs decided that the link between air-borne dioxin (an ingredient in Agent Orange, and also a common air-borne pollutant emitted by waste incineration, some chemical manufacturing processes, cars and trucks, and other industrial sources that burn fuel) and diabetes was so strong, it compensated 270, 000 veterans for diabetes linked to dioxin exposure.

FORBES: Two New Reasons to Worry about Air Pollution: Obesity and Diabetes

Investigators are examining whether the companies overstated the benefits of exotic-sounding ingredients while understating the role of caffeine, a common stimulant that industry critics believe to be the main active ingredient, that person said.

WSJ: Energy-Drink Makers Face New York Probe

Its bitter leaves are an ingredient in South Indian rasam and curries, and its oil is a common additive to cosmetics, laundry soap, shampoos and toothpaste.

FORBES: Is Ancient 'Mocktail' The Answer To Dengue Fever?

"We were in common with a lot of events last year, which were affected by that one magic ingredient - the weather, " Mr Smith said.

BBC: Aerial view of Royal Norfolk Show 2011