Nicotinic acid normal range

The range of nicotinic acid activity in blood, for a group of 28 normal subjects is 3.9-9.6 qg/ml. Only a fraction of less than 1% (0.016-0.05 pg/ml) of this quantity was present in serum. The range in urine was 1.16-1.54 pg/ml. Ninety-seven to 101% of added combinations of nicotinic acid and nicotinamide was recovered when added to blood and urine. In blood, appreciable nicotinic activity is observed only after... 

The usable range for T. pyriformis is from 0.3-300 mug/ml. The organism utilizes pyridoxal, pyridoxamine pyridoxine, and pyridoxal-5-phosphate. Pyridoxamine + pyridoxal yielded the best growth approximately 120 times more pyridoxine is required to yield the same growth as pyridoxamine (Fig. 4). As with nicotinic acid and its amide, when these compounds are added together in the same concentration, the increment of growth is less than the sum of the individual increments. Upon an intramuscular load dose of 100 mg of pyridoxine, peak vitamin Bs levels are reached 2 hours after injection. The curves for 4 normal individuals are illustrated in Fig. 5. 

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