Avoid exceeding the recommended dose: increasing the dosage doesn't enhance the effect but increases the risk of discomfort
A lot of the products making these claims often don't have enough of the stuff to matter
et al (2007) Transport of buryryl-L-carnitine, a potential prodrug, via the carnitine transporter OCTN2 and the amino acid transporter ATB(0,+)
Depending on the amount and type of toxins released and your specific genetic makeup, taking glutathione could cause harm or trigger other health issues
Wang H, Huang Q, Xia J, Cheng S, Pei D, Zhang X, et al
Compounded medications may receive more scrutiny at customs because they look different from commercially manufactured products