All Thymus is a glandular extract of thymus, which plays a role in immune function, lymphocyte formation, and antibody production. Natural Sources All Thymus. Raw Thymus Glandular Concentrate. Dietary Supplement. Whole Raw tissue concentrated from bovine sources specially processed (freeze-dried) at or below -5 o C to preserve natural occurring vitamins, enzymes, nucleotides, lipoproteins and all other cellular components. Raw tissue concentrates imported from New Zealand are made from toxin-free lyophilized glands from animals grazed on rangeland free of pesticides, growth hormones, antibiotics or chemical additives.