All garden chemicals on sale in the United Kingdom are safe to use if you follow the manufacturers' instructions. 

Most products have been issued with a MAPP (Ministerial Approved Pesticide Product) or HSE  (Health and Safety Executive) number which can be found on the pack.

It is essential you read the statutory conditions of use and directions on the product label to check what situation each  individual 'weed killer' (herbicide/pesticide) can be used. 

Find out more information on approved chemicals and their safe use