Facebook post by University of Helsinki

Agriculture and forestry generate side streams that can support the modulation of immune system in both children and adults. Their complex microbial community can be used as part of gardening and landscaping materials that decrease the risk of diseases, such as allergy, asthma and type 1 diabetes.
Playing in the sandbox provides armour for immune system | University of Helsinki helsinki.fi

Your environment can be geared towards disease prevention. ImmunoGarden produces natural gardening and landscaping materials that support the immune system in both children and adults.