TABLE 5.

Results of genetic analysis on teas searching for adulteration.

Author	Aim	Result
Osathanunkul (2018)	Find adulterants in Soursop (Annona muricata L. Annonaceae) teas	Three out of eleven (27%) samples contained incorrect species
Omelchenko et al. (2019)	Examine 6 herbal teas, 6 herbal medicines & 6 spices for adulteration	Twelve (67%) products contained different materials to those labelled. 6 likely to be economically motivated
De Castro et al. (2017)	Examine 32 herbal teas	Two (6%) found to be adulterated
Olivar et al. (2016)	5 Vitex negundo L. Lamiaceae samples, often used as herbal tea in the Philippines	Only one satisfied the database criteria for genetic authenticity
Xin et al. (2015)	Authenticate 90 commercial Rhodiola crenulata (Hook.f. & Thomson) H. Ohba Crassulaceae products from hospitals and drug stores	Only 36 (40%) contained the correct species. 35 (38.9%) contained R. serrata H. Ohba and 9 (10%) R. rosea L. Remaining 10 (11.1%) were 3 other R. species
Duan et al. (2017)	Identify species in Radix Clerodendrum tea samples used in the Dai ethnic group’s medicine	Of 27 samples, only 1 (3.7%) was authentic Clerodendrum japonicum (Thunb.) Lamiaceae. Most were another medicinal species but 4 were potentially toxic Lantana camara L. Verbenaceae
Wang et al. (2016)	To find a DNA signature region which can be used to identify Angelica sinensis (Oliv.) Diels. Apiaceae in decoction powders	Of 9 decoction powders, 7 (78%) were identified as Angelica pubescens Maxim. Apiaceae