There are calls for a Kinder chocolate bar to be recalled, following the discovery that it contained traces of a possible cancer-causing oil.

Germany's Foodwatch found the Kinder Reigel contained mineral oil aromatic hydrocarbons (MOAH), which the European Food Safety Agency has said 'may be carcinogenic'.

It has led to calls for the bar, available in some Aldi stores in Germany, to be recalled.

Germany's Foodwatch found the Kinder Reigel contained mineral oil aromatic hydrocarbons (MOAH), which the European Food Safety Agency has said 'may be carcinogenic'

'There is no acceptable levels of mineral oils in food for consumption,' Johannes Heeg, a Foodwatch campaigner told The Local.

'You can't see it, you can't taste it, but it's in there.

'We recommend not purchasing these products because the levels are simply unacceptable for consumption.'

Foodwatch also found MOAH in two other German products, Lindt’s Fioretto Nougat Minis and Sun Rice Classic Schokohappen.

However, other groups have said the risk is minimal.

The Association of the German Confectionary Agency (BDSI) said there was no need to recall the products as the amounts of MOAH found could 'be consumed without concern'.

The oil is a by-product from the manufacturing process which sometimes finds its way into the finished item.

The European Food Safety Agency says 'foodborne MOAH with three or more, non- or simple-alkylated, aromatic rings may be mutagenic and carcinogenic, and therefore of potential concern'.

A spokesperson for Ferrero told MailOnline in a written statement, 'The discussion about mineral oil components (MOSH/MOAH) in foods is not new and affects a large variety of foods from the most different categories.

'Foodwatch Germany has recently tested several confectionery products and detected traces of mineral oil components. However, traces of mineral oil exist nearly everywhere in the environment and they can be transferred to food in many different ways.

'Main migration sources are, for example, mineral oil components from printing inks that are introduced into the packaging recycling cycle and, through transport containing recycled fiber, migrate to raw materials and foods.

'As this matter impacts on several industries, and also due to the topic's complexity, the joint effort of all food supply chain stakeholders is required, including the commodity trade in and outside Europe.