Bielefeld, Germany - Sauna enthusiasts are advised to use only naturally scented concentrates when pouring water on hot rocks, according to Germany's Sauna Association in Bielefeld.

Aromas can affect the body and can cause allergies in some people.

The best products to use are those made from plant extracts or those with a quality assurance mark.

Different aromas have different affects on the human nervous system. They can cause tension as well as relax the body.

Conifer aromas such fir or pine have a calming affect. Lavender is also good for relaxing.

Eucalyptus and peppermint clear nasal passages and make it easier to breath.

Citrus aromas such as grapefruit, orange and lemon are invigorating and energise the body. (dpa)