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THE BIOCHEMISTRY OF B VITAMINS 



Table 21. Some Reported Requirements of Humans for B Vitamins 



Thiamine 



Riboflavin 

 Nicotinic acid 



1.0 - 1.8 mg per day 



3.2 mg per day 



1.06 mg per day 

 0.44 mg per 1000 Cal. 



1. 5- 1.8 mg per day 



3.7 mg per day 

 1.3 - 1.4 mg per day 



10.0 -18.0 mg per day 



40.0 mg per day 



15.0 -20.0 mg per day 



Remarks Referenc 



Recommended intake and 



not requirement (60) 



Based on good diets (62) 



Minimum (63) 

 Minimum for "normal" 



male 



Recommended intake (60) 



Recommended intake (62) 



Based on excretion studies (64) 



Recommended intake (60) 



Recommended intake (62) 

 Based on blood level 



studies (65) 



Under remarks, "recommended" means that the authors cited in the reference infer that this level is 

 suitable for the normal diet of individuals in order to maintain a state of good health. It will be noted 

 that in some cases where there may be no nutritional requirement under normal circumstances, it is never- 

 theless suggested that a level of the vitamin be provided in the diet as a precaution in view of our lack of 

 knowledge regarding the subject. 



120-200 mg/kg per day 



Prevents kidney degenera- 

 tion and liver lipotropism 



(83) 



