Table 1.
Selenium intake and blood levels in different geographic regions worldwide
| Country | Daily intake (µg) | Blood/serum (µg/liter) |
|---|---|---|
| Russia | 15-130 | 67-106 |
| Japan | 27-89 | 80-155 |
| China* | 2-6990 | 5-7800 |
| USA | 60-160 | 100-350 |
| Canada | 113-220 | 143 |
| Germany | 38-47 | 89-98 |
| Tibet | 5-15 | 5-47 |
| Finland until 1984 | 40 | 69 |
| Finland after 1984 | 80 | 109 |
Note. Daily Se intake and its content in human serum markedly differ in different countries [23-28]. Introduction of Se-containing dietary supplements in some regions of Europe and Central Asia (Finland, Keshan County in China) with insufficient Se intake resulted in the long-term improvement of population health and disease prevention.
* Due to the heterogeneity of soil, Se intake and, subsequently, its concentration in the human serum differ greatly in different regions of China [28].