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Arginine forms are interesting in terms of formulation due to their solubility, stability and suitability in unit materials

10.1016/j.redox.2017.03.024 [DOI] [PMC free article] [PubMed] [Google Scholar] Vaur P., Brugg B., Mericskay M., Li Z., Schmidt M

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The reason it requires multiple treatments is that the ink particles are blasted from larger particles into smaller particles with each session and if they were already close to the end of that process (very fine particles), they wouldnt be very visible in your skin