Table 3.

Concentrations of ergothioneine in human serum

	Concentration		Study
Crohn’s disease	7 µg/ml		(401)
Healthy volunteer	38 µg/ml		(401)
Healthy 1–10 years	15–20 µg/ml		(387)
Healthy 11–18 years	37 µg/ml		(387)
Healthy 19–50 years	23–30 µg/ml		(387)
Healthy middle-aged and older	Median 1 μm = 229 ng/ml, range 0·36–3·08 μm*	Inverse correlation with age	(571)
Mice on normal diet	58 µg/ml		(131)

^*Molecular weight = 229·3, so 1 mm = 229 mg/l.