Dr. Forrest C. Allen - 2. / June 18, 1930.

At present we are supplying a number
of pharmaceutical houses who are licensed by the Foundation,
with irradiated ergosterol which they market under the trade
name of Viosterol.

Our Laboratories also developed
methods of irradiating the yeast directly; that is, without
extracting the ergosterol from it, and all of our yeast sold
in the familiar foil wrapped cakes with the yellow labels is
irradiated sufficiently so that each cake is equivalent in
vitamin D potency to a teaspoonful of standard cod liver oil.
The control and standardization of the vitamin D content of
our irradiated ergosterol and irradiated yeast are in charge
of men who have devoted years of time to vitamin work, and
frequent tests are made of the yeast as it is cca tip in
various parts of the country.

We have been irradiating our yeast
about a year, and of course before going out with it, we ©
had some clinical and laboratory investigations carried out
to make certain that the irradiation had in no way lessened
its other corrective values. We had no reason to think that
it would, but wanted to be certain of it before we started
to market the new.product.

Assuring you that we appreciate your
continuing interest in our product and your recommendation
of it to your students, and hoping that your summer season
on the coaching schools may be pleasant and successful, we
are

Very truly yours,
STANDARD BRANDS INCORPORATED

Ene. “ee CA. at

aw De. C. A. Smith