That's the finding of a Dutch study published Jan
Cost-constrained recovery research
There are two types of melanin in the skin, pheomelanin and eumelanin
Most researchers start at 250 mcg once daily, confirm mcg-per-ml concentration before every draw, and cycle 6-8 weeks on with 4-6 weeks off between rounds for full recovery
We provide here additional evidence, notably from redox proteomic approaches that most if not all enzymatic steps of the reductive sulfate assimilation and of methionine synthesis pathways may be controlled by oxidative modification of the enzymes, primarily protein persulfidation but also, disulfide bond formation, protein sulfenylation, nitrosylation, and glutathionylation to a lesser extent
In short, 1 injection can be taken on a monthly basis to maintain results