Glandular and organ powders are sold either freeze-dried or desiccated. The difference shows up in price, in shelf stability, and in how the powder behaves on your line.
This post explains what lyophilization actually does to organ tissue, where the heat-treatment step sits in the sequence, and what to ask a supplier about both. For our flagship US grass-fed material, the work described here is done by our sister company, Flatiron Food Factory, in Loveland, Colorado. Gembra Health distributes what Flatiron makes, alongside material from other origins.
What is lyophilization?
Lyophilization is freeze-drying. Water is removed from frozen material under vacuum by sublimation, so ice turns straight to vapor without passing through a liquid phase.
That is the difference from spray-drying or heat-drying, which drive water off as a liquid at higher temperatures. Drying from the frozen state keeps the tissue cold for most of the process and avoids a long warm, wet stage.
How does freeze-drying work, step by step?
In three stages: the tissue is frozen, most of the water is sublimed off under vacuum, and the last bound water is driven off at the end. The output is a dry, porous cake that is then milled to spec.
Freezing
Organ tissue goes into the dryer frozen solid. The water has to be fully frozen so that it leaves as ice rather than melting.
Primary drying (sublimation)
The chamber is pulled down to a deep vacuum and the shelves supply controlled heat, because sublimation needs energy to happen. Ice turns to vapor and is collected on a cold condenser. This is the longest stage, and it removes most of the water.
Secondary drying (desorption)
Water bound into the tissue does not leave as ice. It is driven off at the end of the cycle, still under vacuum, at a somewhat higher shelf temperature. What comes out is a dry cake with low residual moisture, ready for milling.
Is freeze-drying heat-free?
No. The dryer itself adds controlled heat during sublimation and secondary drying. The product stays cold while ice is subliming, but heat is part of the cycle.
There is also a separate kill step before drying. Flatiron heat treats our flagship raw material in commercial ovens at a minimum of 145°F for seven minutes, and higher where the program calls for it. That is pathogen control. The material comes out looking almost rare: it is heat treated, not cooked, and then it goes on to freeze-drying and milling.
The more common kill step in this category is high-pressure pasteurization (HPP), usually paired with a chemical bath or irradiation, and usually applied to FDA pet-downgraded raw material. Flatiron uses none of the three on the flagship tier. Material we distribute from New Zealand, Australia and South America is HPP-processed to those regions’ standards, and we tell you plainly which origin a lot is. Quality and sourcing sets out the two approaches side by side.
If a finished label is going to say anything about processing or temperature, get the actual sequence from your supplier in writing. Claims on a finished product are the brand owner’s to make and substantiate.
Why does residual moisture matter?
Low residual moisture is what makes a freeze-dried powder shelf-stable and free-flowing. Organ powder is hygroscopic: if it is not dried down properly, or not barriered once it is, it picks up water and cakes.
That is why water activity is on the certificate of analysis for every order, so the number is measured rather than assumed. Once a bag is open, reseal it well, because the powder will start drawing moisture from the room.
What is the difference between freeze-dried and desiccated?
Freeze-dried is the premium tier and desiccated is the value tier. Technically every powder is desiccated, since the word just means dried. As a category, though, it means dried by a method other than freeze-drying.
We offer both. Freeze-dried material is made by Flatiron. Desiccated material is sourced rather than made in house, and the price difference per kilo is large enough to matter if you are buying on price. Say which form your formula calls for on the quote request, and we will tell you the origin and tier of each option.
What else belongs in a glandular powder spec?
Form is one line of the spec. These are the others to pin down before the first order:
- Fat. Non-defatted is the default; defatted is available on request. Non-defatted vs defatted organ powders covers when each makes sense.
- Mesh and density. Flatiron runs a hammer mill for most material and a cryogenic mill for very fine mesh or high-fat tissue such as heart, with a milling scientist deciding which. Our manufacturing explains how the spec is held batch to batch.
- Origin and tier. US grass-fed is the flagship tier. Grass-finished, organic and conventional tiers are also available, and so is material from New Zealand, Australia, South America and China, all stocked in the US.
- Additives. None. Single-ingredient powders, no fillers, no flow agents.
- Documentation. A certificate of analysis, lab results and a specification sheet ship with every order.
What do formulators use freeze-dried glandulars in?
Mostly in formulas built around a single organ or gland, and in multi-organ blends. A glandular powder is specified by organ because each tissue has its own composition. Liver naturally contains vitamin A, B12, folate, copper and heme iron. Heart naturally contains CoQ10.
The glandular range we distribute includes thymus, thyroid, adrenal, pancreas, spleen and lymph, alongside the organ range led by liver, heart and kidney. The product catalog lists every organ and gland we carry.
Request a quote
Tell us the organ, the form (freeze-dried or desiccated), the fat spec and the mesh or density you formulate to. Request a quote and we will come back within 12 to 24 hours with pricing, origin availability and lead time. Orders start at 10 kg per ingredient.