Libertarians acknowledge the need for regulations. The importance is that they are stable and apply to everyone equally. Labels for food that list ingredients is great because it has been fair and stable as an example.
"Letting the market decide" is not a form of regulation.
The main goal of libertarians is to get prices to work. The alternative that i fear we are heading towards is price controls then mandated requirements for output. E.g produce 100 loafs of bread today that will sell for $1.00 or off to jail you go.