The proprietary preparation “Sanatogen” is claimed to consist of about 95 per cent. casein and 5 per cent. sodium glycerophosphate. The analysis of C. B. Morison[122] is as follows:
| Water | 9.97 |
| Total nitrogen | 12.81 |
| Nitrogen, ppt. by acetic acid | 12.54 |
| Casein | 80.01 |
| Ether extract | 0.11 |
| Ash | 5.59 |
| Sulphur, total | 0.73 |
| Sulphur in casein | 0.64 |
| Phosphorus, total | 1.49 |
| Phosphorus in casein | 0.69 |
| Phosphorus in inorganic form | 0.11 |
In connection with the above analysis it was demonstrated that sodium glycerophosphate was present. Sanatogen, therefore, consists essentially, on the water-free basis, of about 90 per cent. casein and 5 per cent. sodium glycerophosphate, with a small amount of an unidentified nitrogenous compound containing both sulphur and phosphorus, and a small amount of phosphorus in organic combination. The manufacturers claim that the two essential ingredients exist in Sanatogen as a definite chemical compound. Certain authorities, on the other hand, have insisted that the casein and glycerophosphate have not been chemically combined and that Sanatogen is simply a mechanical mixture of the two. Which claim is correct we will not consider here, for indeed it is of little importance, for whether or not chemically combined the action of the digestive fluids of the body would speedily break down the alleged compound into its constituents, and the body would have casein and the glycerophosphate offered for its use, just the same as though they had been offered as a mere mechanical mixture.
It being apparent that Sanatogen consists almost entirely of casein and sodium glycerophosphate, the former well-known ingredient making up nine-tenths of its weight, the question naturally arises how a mixture of these two common substances can acquire, simply by that admixture, unusually valuable properties not possessed by the two components. Leading physiologists quite generally agree that phosphorus in the form of glycerophosphates influences metabolism very little. Furthermore, it is obvious that the food value of the small amount of glycerin present must be slight. It is apparent therefore, that whatever nutriment or energy Sanatogen supplies must be dependent on its main constituent casein.
Sanatogen is commonly sold at retail in 100 gm. or 200 gm. packages for $1 and $1.90, respectively. It is possible that in larger quantities these prices might be shaded somewhat, but the fact remains that the ordinary retail purchaser of Sanatogen pays for it about 1 cent per gram, or about $4.50 per pound. If the value of Sanatogen depends on its casein, one might ask, in all fairness, why should the patient pay $4.50 per pound for Sanatogen when he can secure ordinary commercial casein for 8.5 to 10 cents per pound! (The Casein Mfg. Co. of New York quoted to me their No. 60 casein at 10 cents per pound in 5-pound lots, 8.5 cents per pound f. o. b. Bainbridge, N. Y., in 100-pound lots, and 8.5 cents per pound, freight paid, in 500-pound lots.) I have purchased Sanatogen from a wholesale druggist at the rate of $2.75 for 400 gm., or $3.12 per pound, so that under the most favorable conditions the cost of Sanatogen is more than thirty times as great as the commercial casein in question.
Is the consumer justified in paying this exceedingly high price for purified casein? The following feeding experiments were carried out to answer this query.
FEEDING EXPERIMENTS
White rats were chosen for the experimental animals because of their adaptability for tests of this kind, as shown by the extended successful experience of Osborne and Mendel, and also because, by using white rats, I could take advantage of the equipment and the experience of my colleagues, Dr. T. B. Osborne, Prof. L. B. Mendel and Miss Edna L. Ferry.
The value of Sanatogen as compared with commercial casein was studied from two points of view: