"Orchic" was a name used for many of the early testicle-based supplements. You'll also see the term "glandulars" thrown around too, although these can refer to different things than testicles.
Vince Gironda was one of the early promoters of bodybuilding supplements in general, and orchic shows up in a number of his diets/supplement stacks.
I don't know whether the supplements were due to a lack of chemically isolated vitamins and minerals (e.g., you couldn't just buy a Vitamin D3 capsule back then) or whether providing the nutrients in their naturally occurring states actually works better.
Other supplements from that time period: germ oils (wheat, rice, soybean -- sold as Tri-Germ Oil and as Energol), halibut oil, kelp tablets, brewers yeast, dessicated liver, alfalfa tablets... in addition to standard Vitamin C, Vitamin B Complex, Vitamin E, etc. stuff that you have today.