Increased in carbon isotope ratios of Brazilian fingernails are

Longitudinal isotope ratio variations in human hair and nails - ScienceDirect

Mapping carbon and nitrogen isotopic composition of fingernails to demonstrate a rural–urban nutrition transition in the Center‐West, Northeast, and regions of Brazil - Nardoto - 2020 - American Journal of Physical

Homogeneous diet of contemporary Japanese inferred from stable isotope ratios of hair

Vegetation and soil carbon‐13 isoscapes for South America: integrating remote sensing and ecosystem isotope measurements - Powell - 2012 - Ecosphere - Wiley Online Library

Longitudinal isotope ratio variations in human hair and nails - ScienceDirect

Carbon and nitrogen isotopic composition of commercial dog food in Brazil [PeerJ]

Increased in carbon isotope ratios of Brazilian fingernails are correlated with increased in socioeconomic status

Zinc isotope ratios measured for the four types of gloves tested in

Longitudinal isotope ratio variations in human hair and nails - ScienceDirect

Studies

USGS -- You are what you eat