Most participants in a toenail clipping sample study

According to Official Guinness Records,

The largest collection of toenail clippings consists of samples from 24,999 individuals and was compiled by Atlantic PATH (Canada) as of 25 October 2013.
The clippings were collected as part of a scientific study, rather than being a personal collection.

For a complete list of 2013 records, please visit 2013 Guinness Records in Canada.

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