V., Machado, E
Test tube absorbance comes from unreacted glutathione and sample interferences
I believe that all three of the serums are cloudy white fragrance-free serums that absorb into the skin quickly
However, certain circumstances may warrant testing including pre-existing liver or kidney conditions where monitoring organ function during therapy provides appropriate oversight, specific health concerns that might benefit from objective biomarker assessment, desire to objectively measure oxidative stress markers or glutathione status before and during therapy, and medical conditions requiring monitoring for safety reasons
& Radsak, M
Building on these regional trends, in terms of recent policies, in 2025, amaranth was selected by Mexico as part of the FAOs One Country, One Priority Product (OCOP) initiative, signaling an institutional effort to promote its sustainable production, improve its integration into value chains, and strengthen its role in national food security (Mexico Advances Sustainable Amaranth Production, 2025)