Making mushroom capsules at home is straightforward: you dry the mushrooms, grind them into a fine powder, and pack that powder into empty capsules using a simple filling tool. The whole process takes a day or two (mostly hands-off drying time) and costs a fraction of what you’d pay for pre-made supplements. Here’s how to do it right, from selecting your equipment to storing the finished capsules.
Equipment You’ll Need
The setup is minimal. A food dehydrator, a grinder, a digital kitchen scale, empty capsules, and a capsule filling board will cover everything. You can get started for under $50 if you already own a dehydrator.
A capsule filling board (sometimes called a capsule holding plate) is the key tool. It’s a flat plate with rows of holes sized to hold empty capsule bodies upright while you pack powder into them. Most boards fill 24 or 100 capsules at a time. They come with a tamping tool, a flat press that compacts powder evenly into each capsule so you get consistent fills. These boards are widely available online for $15 to $30.
A digital scale accurate to 0.01 grams lets you verify how much powder each capsule holds. This matters more than most people realize, since loosely packed powder and firmly tamped powder can differ by 30% or more in weight per capsule.
For grinding, a standard blade-style coffee or spice grinder works well for small batches. Grind in short pulses to avoid heating the powder, and sift through the result. Any chunks that don’t pass through a fine mesh strainer should go back in for another round. The finer and more uniform your powder, the more consistently your capsules will fill.
Choosing Your Capsule Size
Capsules come in sizes ranging from 1 (smallest common size) to 000 (the largest). Mushroom powder has a moderate density, typically around 0.6 to 0.8 grams per milliliter depending on how finely you grind it. That density determines how many milligrams each capsule actually holds.
- Size 1: Holds roughly 400 to 545 mg of mushroom powder. The easiest to swallow, but you’ll need more capsules per dose.
- Size 0: Holds roughly 540 to 720 mg. A good middle ground for most people.
- Size 00: Holds roughly 600 to 800 mg. The most popular choice for mushroom supplements, since one or two capsules can deliver a meaningful dose.
- Size 000: Holds roughly 820 to 1,100 mg. Large and harder to swallow, but useful if you want fewer capsules per day.
Those ranges reflect loosely filled versus firmly tamped powder. If you tamp well and your powder is fine, you’ll land toward the higher end. For reference, clinical studies on lion’s mane mushroom have used daily doses of 1,050 to 3,000 mg split across three or four servings. Two size-00 capsules three times a day would put you squarely in that range.
Gelatin vs. Vegetable Capsules
Empty capsules come in two main materials: gelatin (animal-derived) and HPMC (a plant-based cellulose). Beyond the obvious dietary preference, there’s a practical reason to care about this choice when working with mushroom powder.
Gelatin capsules need 12% to 16% internal moisture to stay flexible. If they dry out, they turn brittle and crack. HPMC capsules contain only 2% to 6% moisture and hold up well in dry conditions. More importantly, HPMC capsules transfer less moisture to their contents. Since mushroom powder can absorb ambient moisture and degrade over time, the lower moisture environment inside a vegetable capsule gives your finished product better shelf stability. The one trade-off is that HPMC shells allow slightly more oxygen through their walls, which could matter for oxidation-sensitive ingredients, but mushroom powder is not particularly oxygen-sensitive, making HPMC the better fit here.
Drying and Grinding the Mushrooms
Fresh mushrooms are roughly 90% water, so drying is essential. You’re aiming for completely crisp, snap-when-you-bend-them dry pieces with no remaining flexibility.
Slice your mushrooms into thin, uniform pieces (about 1/8 inch thick) and spread them in a single layer on your dehydrator trays. Set the temperature to 117°F (47°C) and let them run for 8 to 12 hours. This low temperature preserves the bioactive compounds, particularly the polysaccharides that give medicinal mushrooms their health properties. Higher temperatures speed things up but risk degrading these compounds. Check at the 8-hour mark: if the slices still bend without snapping, give them more time.
Once fully dried, let the pieces cool to room temperature before grinding. Warm mushrooms can introduce condensation inside a sealed grinder, adding moisture back into your powder. Grind in small batches, pulsing for 5 to 10 seconds at a time. Shake the grinder between pulses to redistribute any larger pieces. Pass everything through a fine mesh strainer and regrind whatever doesn’t fall through. You want a powder with the consistency of flour, not coarse sand. Inconsistent particle size leads to air pockets in your capsules and unreliable dosing.
Filling the Capsules
Each empty capsule has two halves: a shorter, wider body and a longer, narrower cap. Separate these by hand or use the filling board’s built-in separation feature. Most boards have you place the whole capsule into the holes, then lift off a top plate that pulls the caps away, leaving the bodies standing upright and ready to fill.
Spread your mushroom powder over the board using a card or spatula, pushing it into each capsule body. Then use the tamping tool to press the powder down firmly and evenly. This step is important: a single firm tamp can increase the amount of powder per capsule by 20% to 30% compared to just letting it settle. Repeat the spread-and-tamp process two or three times until each capsule body is packed to the brim. Brush any excess powder off the top of the board.
Now weigh a few filled bodies on your scale (subtract the weight of an empty body, which is printed on most capsule packaging). This tells you exactly how many milligrams each capsule contains, so you can calculate your daily dose with confidence. Once you’re satisfied with the fill weight, press the caps back onto the bodies. You should feel a light click as they lock into place.
Calculating Your Batch
Before you start, a little math saves a lot of guesswork. Decide on your target daily dose and how long you want a batch to last. Say you want 1,500 mg of lion’s mane per day and you’re using size-00 capsules that hold 700 mg each. That’s roughly 2 capsules per day (1,400 mg, close enough). For a 30-day supply, you’d need 60 capsules and about 42 grams of powder. Fresh mushrooms lose about 90% of their weight during drying, so you’d start with roughly 420 grams (just under a pound) of fresh mushrooms to yield that amount.
Write this down before you begin. It’s easy to over-dry or under-buy if you’re winging it.
Storage and Shelf Life
Fresh mushrooms last only 1 to 3 days at room temperature, but properly dried mushroom powder stored in sealed capsules is a different story. Keep your finished capsules in an airtight container, ideally a glass jar with a tight lid or a vacuum-sealed bag. Store them in a cool, dry, dark place. A pantry shelf works fine; the refrigerator is unnecessary and can introduce condensation each time you open the container.
Tossing in a small silica gel packet helps absorb any residual moisture. If you used HPMC capsules and your powder was thoroughly dried, expect your capsules to stay potent for 6 to 12 months. The enemies are moisture, heat, and light, so avoid storing them near the stove, in a window, or in the bathroom. If the capsules ever feel soft, sticky, or develop an off smell, the powder has absorbed moisture and should be discarded.
Label each batch with the mushroom species, fill weight per capsule, and the date you made them. It’s a small step that pays off when you’re reaching into the cabinet three months later trying to remember what you put in there.