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This study aims to determine the exposure to soluble tattoo ink ingredients and their excretion within 24 h after tattooing. In this clinical study, 24 subjects were tattooed with black or red tattoo ink to which the 3 tracer substances, potassium iodide, 4-aminobenzoic acid (PABA) and 2-phenoxyethanol (PEtOH), had been added to mimic known substances found in tattoo inks. Tracers and their metabolites were quantified in blood, urine, ink and consumables pre- and post-tattooing. Tattooed skin area was determined using picture analysis. PABA metabolism upon tattooing was compared to peroral administration. Skin fibroblasts and macrophages were tested in vitro for their ability to metabolise PABA. All tracers or their metabolites were identified in urine; iodide and the PABA metabolite 4-acetamidobenzoic acid (ACD) were identified in plasma. The worst-case scenario for systemic ink exposure was estimated to be 0.31\u00a0g ink per tattoo session (75th percentile). Peroral administration resulted in lower levels of ACD than tattooing. Fibroblasts and macrophages were capable of converting PABA into ACD. Our results are the first human in vivo data on soluble tattoo ink ingredients and suggest that the overall exposure might be lower than the estimates previously used for regulatory purposes. In addition, the first-pass effect by skin metabolism leads to an altered metabolite profile compared to oral exposure. Skin metabolism might also contribute to detoxification of certain carcinogenic substances through\n                    <jats:italic>N<\/jats:italic>\n                    -acetylation.\n                  <\/jats:p>","DOI":"10.1007\/s00204-025-03959-8","type":"journal-article","created":{"date-parts":[[2025,1,31]],"date-time":"2025-01-31T07:37:51Z","timestamp":1738309071000},"page":"1341-1354","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Tat_BioV: tattoo ink exposure and biokinetics of selected tracers in a short-term clinical study of 24 subjects"],"prefix":"10.1007","volume":"99","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5363-8436","authenticated-orcid":false,"given":"Susanne","family":"Kochs","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sandra","family":"Schiewe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3912-1718","authenticated-orcid":false,"given":"Milena","family":"Foerster","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7251-5351","authenticated-orcid":false,"given":"Kathrin","family":"Hillmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2893-090X","authenticated-orcid":false,"given":"Claudia","family":"Blankenstein","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3937-9906","authenticated-orcid":false,"given":"Martina C.","family":"Meinke","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9138-7551","authenticated-orcid":false,"given":"Josephine","family":"Kugler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Kocovic","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5866-901X","authenticated-orcid":false,"given":"Andreas","family":"Luch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3528-3752","authenticated-orcid":false,"given":"Ulrike","family":"Blume-Peytavi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9313-7193","authenticated-orcid":false,"given":"Ines","family":"Schreiver","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,1,31]]},"reference":[{"key":"3959_CR1","doi-asserted-by":"publisher","DOI":"10.1159\/000369197","author":"M Agnello","year":"2015","unstructured":"Agnello M, Fontana M (2015) Survey on European studies of the chemical characterisation of tattoo ink products and the measurement of potentially harmful ingredients. 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