Jack Edward Thuna was an herbalist who owned and operated a health food store in Toronto. The business dates back to 1888 and was started by his father, Dr. Max H. Thuna. The store was originally located at 436 Queen Street West and was called Thuna's Balsam Remedies, Limited. Jack and Max were also listed as chiropractors in the 1925 Toronto Jewish City and Information Directory. The store later moved to 298 Danforth Avenue and its name was changed to Dr. Thuna Nature Remedies. It still exists today on Danforth as Thuna Herbals.
Jack Thuna was married to Anne Levine in 1925, and they had two sons: Mortimer, born in 1928, and Alvin, born in 1934. Mortimer and Alvin also became master herbalists and helped run the family business. Alvin's son, Joel Thuna, is also a master herbalist who currently lives in Toronto.