Table 1. Naturally occurring concentrations of quercetin and p-coumaric acid in bee products¹.

		mean concentration (μM)2			Max3 (μM)	Ref.
		Min	Average	Max
Quercetin	royal jelly		0.7			[28]
	Honey	0.0	26.0	228.3	n/a	[9,28–44]
	Pollen	5.8	1 190.8	3 250.0	n/a	[45–51]
	Propolis	0.0	4 227.5	27 193.6	54 648.74	[28,52–61]
p-coumaric acid	Honey	0.0	42.5	1 914.1	n/a	[29–31,35,36,41–43,62–64]
	Pollen	4.9	680.8	2 499.3	n/a	[45,46,50,51,65]
	Propolis	0.0	14 413.9	69 492.2	82 293.35	[52,53,55,57–59,66–75]

¹ Upper and lower limits of each group of bee products overlap each other. Phytochemical concentrations varied according to botanical origin (S1 Table) and geographic source (S2 Table).

² The data, originally reported as a mean value in the cited paper, reported here.

³ This column shows the maximum value of the concentration of the phytochemical reported in the cited paper as a range. Studies in which values were reported as lower than the maximum mean concentration (sleft-hand column) were entered here as “n/a”.

⁴ Aliyazıcıoglu et al. [52] show this maximum value of quercetin in propolis.

⁵ Bertelli et al. [53] show this maximum value of p-coumaric acid in propolis.