Its declared main goal is to improve the protection of human health and the environment from risks posed by chemical substances. It is backed by the precautionary principle as a main pillar of the EU chemicals legislation. It basically applies to all chemicals including those used in a wide range of consumer products. REACH places the burden of proof on companies that must provide the required data to demonstrate the safe use of a substance before it may be placed on the market. Authorities can limit or ban the manufacture, import, use or placing on the market of a substance whenever there is an `unacceptable risk to human health or the environment.