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Ascorbic acid levels vary according to season in this study of 1077men aged 54 in Finland. 5 per cent of the individuals had vitamin C levels below 4mg/l (moderate risk. 8.8 per cent had levels below 2.0mg/l which is considered vitamin C deficient. Blood pressure is affected by levels of vitamin C.

"Vitamin Status of 54-Year Old Eastern Finnish Men Throughout The Year", Parviainen, Markku T. and Solanen, Jukka T., International Journal of Vitamin and Nutrition Research, 1990;60:47-51.