Julian's research at Glidden changed direction in 1940 when he began work on synthesizing progesterone, estrogen, and testosterone from the plant sterols stigmasterol and sitosterol, isolated from soybean oil by a foam technique he invented and patented. At that time clinicians were discovering many uses for the newly discovered hormones. However, only minute quantities could be extracted from hundreds of pounds of the spinal cords of animals.

In 1940 Julian was able to produce 100 lb of mixed soy sterols daily, which had a value of $10,000 as sex hormones. Julian was soon ozonizing 100 pounds daily of mixed sterol dibromides. The soy stigmasterol was easily converted into commercial quantities of the female hormone progesterone, and the first pound of progesterone he made, valued at $63,500 was shipped to the buyer, Upjohn, in an armored car. Production of other sex hormones soon followed.

His work made possible the production of these hormones on a larger industrial scale, with the potential of reducing the cost of treating hormonal deficiencies. Julian and his co-workers obtained patents for Glidden on key processes for the preparation of progesterone and testosterone from soybean plant sterols. Product patents held by a former cartel of European pharmaceutical companies had prevented a significant reduction in wholesale and retail prices for clinical use of these hormones in the 1940s. He saved many lives with this discovery.

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