Law, 57, (pictured) was originally charged with 14 counts of second degree murder in December after he allegedly sold 1,200 packages of lethal substances on the internet to people in 40 countries.
There has been a rise in the number of deaths related to the use of forums in which members share information about lethal substances and encourage others to take their own life.
The woman, who has not been named, emailed the Metropolitan Police s chemical reporting team in August 2021 after she lost her daughter who bought a lethal substance from Law (pictured).
Kenneth Law, 57, has now been charged with a total of 28 offences after he allegedly sold 1,200 packages of lethal substances on the internet to people in 40 countries.