Lumb M, Perry J, Deacon R, Chanarin I
Scand J Haematol. 1981 Jan;26(1):61-4. doi: 10.1111/j.1600-0609.1981.tb01625.x.
Inhalation of nitrous oxide, which inactivates vitamin B12, is followed by a rise in the plasma folate level. The concentration of plasma folate remains elevated throughout the period of exposure to nitrous oxide. Returning the rats to the air is followed by a fall to pre-exposure plasma folate levels within 24 h.