The safety profile of topical GHK-Cu is well-established across decades of use and multiple clinical trials
Leukemia 20:610-619, 2006
(For instance, glutathione is a key ingredient in the Myers Cocktail IV, which also includes vitamins B12, C, and B Complex, as well as zinc and magnesium)

Santomauro DF, Erskine HE, Mantilla Herrera AM, Miller PA, Shadid J, Hagins H, Addo IY, Adnani QES, Ahinkorah BO, Ahmed A, Alhalaiqa FN, Ali MU, Al-Marwani S, Almazan JU, Almustanyir S, Alvi FJ, Amer YSAD, Ameyaw EK, Amiri S, Andrei CL, Angappan D, Antony CM, Aravkin AY, Ashraf T, Ayuso-Mateos JL, Barrow A, Batra K, Bemanalizadeh M, Bhagavathula AS, Bhaskar S, Bhatti JSS, Bolla SR, Britton G, Castaldelli-Maia JM, Catal-Lpez F, Caye A, Chattu VK, Chong YY, Ciobanu LG, Cortese S, Cruz-Martins N, Dachew BA, Dai X, Darwish AH, Dashti M, de la Torre-Luque A, Diaz D, Ding DD, Dy ABC, Dziedzic AM, Ebrahimi Meimand S, El Meligy OAA, El Sayed I, Elgar FJ, Fagbamigbe AF, Faris PS, Faro A, Ferreira N, Filip I, Fischer F, Gandhi AP, Ganesan B, Gebregergis MW, Gebrehiwot M, Ghaderi Yazdi B, Ghasemi M-R, Ghasemzadeh A, Gunturu S, Gupta VB, Gupta VK, Halim SA, Hall BJ, Han F, Haro JM, Hasaballah AI, Hay SI, Hedley D, Helfer B, Hossain MM, Hwang B-F, Ibrahim UI, Ilaghi M, Islam MR, Islam SMS, Iyer M, Jaggi K, Jahrami H, Jamshidi E, Khaleghi A, Khan AA, Khan MJ, Khidri FF, Kim K, Koh HY, Kumar M, Landires I, Le LKD, Lee SW, Li Z, Lim SS, Martinez-Raga J, Marzo RR, Matthew IL, Maugeri A, Mestrovic T, Mitchell PB, Mohammed S, Mokdad AH, Monasta L, Montazeri F, Mrejen M, Mughal F, Murray CJL, Myung W, Nauman J, Newton CRJ, Nguyen HLT, Nri-Ezedi CA, Nwatah VE, Oladunjoye AO, Olufadewa II, Ordak M, Otstavnov N, Palma-Alvarez RF, Parikh RR, Park S, Pasovic M, Patel J, Pereira M, Pereira MO, Phillips MR, Polanczyk GV, Pourfridoni M, Puvvula J, Radfar A, Rahim F, Rahman M, Rahman MA, Rahmani AM, Rahmati M, Ratan ZA, Rhee TG, Ronfani L, Roy P, Saddik BA, Saghazadeh A, Sakshaug JW, Salehi S, Samuel VP, Sankararaman S, Saravanan A, Satpathy M, Schumacher AE, Schwebel DC, ekerija M, Shafiee A, Shahabi S, Shamim MA, Silva JP, Solomon Y, Sumpaico-Tanchanco LBC, Swain CK, Tabars-Seisdedos R, Temsah M-H, Tromans SJ, Tzivian L, Varma RP, Vinueza Veloz AF, Vinueza Veloz MF, Walde MT, Waqas M, Wickramasinghe ND, Yesodharan R, Yon DK, Youm Y, Zaman BA, Zeng Y, Zieliska M, Whiteford HA, Brugha T, Scott JG, Vos T, Ferrari AJ (2025) The global epidemiology and health burden of the autism spectrum: findings from the Global Burden of Disease Study 2021

To do this, large amounts of mercury are usually mixed with gold-containing materials to create a gold-mercury alloy called amalgam
The reason for 4 stars instead of 5 is that I didnt see the dramatic anti-aging results I was hoping for