Table 3.

Some examples of melatonin content in different plants and foods.

Plant or food	Melatonin content	References
Tomato	3–114 ng/g	Stürtz et al., 2011
Walnuts	3–4 ng/g	Reiter et al., 2005
Cereals (rice, barley)	300–1,000 pg/g	Hattori et al., 1995
Strawberry	1–11 ng/g	Iriti et al., 2010
Olive oil	53–119 pg/ml	de la Puerta et al., 2007
Wine	50–230 pg/ml	Murch et al., 2010
Beer	52–170 pg/ml	Maldonado et al., 2009
Cow's milk (unprocessed)	3–25 pg/ml	Májovský et al., 2017
Night-time milk	10–40 ng/ml	Tan et al., 2014
Whole yellow corn	0.28–1.3 ng/g	Tan et al., 2014
Whole chicken meat and skin	0.23–2.3 ng/g	Tan et al., 2014
Chicken heart and liver blend	1.0–1.2 ng/g	Tan et al., 2014