How to Make Herbal Capsules and Use Herb Powders
Not every herb tastes good. Some of the most potent and useful plants in the materia medica are, frankly, difficult to take any other way than encapsulated. Valerian root is famously pungent. Bitter herbs like dandelion root or gentian are effective precisely because of their bitterness, but that does not mean everyone wants to taste it. Capsules offer a practical, flavour-neutral way to take herbs consistently and at a known dose.
They are also one of the most familiar forms for people who are new to herbalism. If you have ever taken a vitamin or a supplement, you already understand the basic concept. The difference is that you are making these yourself, from herbs you have chosen and sourced.
What Are Herb Powders?
A powdered herb is simply a dried herb that has been ground finely, either through commercial milling or using a home herb grinder, coffee grinder, or high-powered blender. The powder increases surface area, which generally increases the speed and efficiency of extraction (within the digestive tract, in the case of capsules, or in water, in the case of mixing into food or drink).
Powders can be:
- Encapsulated in gelatin or vegan capsules
- Added directly to smoothies, juices, or warm water
- Mixed into food (golden milk blends, adaptogen-spiked oat porridge, and similar preparations are all based on herb powders)
- Used to make electuaries (powders mixed with honey to form a paste, an ancient and underrated delivery method)
Step by Step: Filling Capsules at Home
What you need:
- A finely ground herb powder (commercial suppliers often sell pre-powdered herbs; alternatively, grind dried herbs yourself)
- Empty vegetable capsules (size "00" is the most common; available from health food stores and online)
- A small plate or shallow dish
- Optional: a capsule filling machine (speeds up the process considerably if you are making larger quantities)
Manual method:
- Separate the capsule halves.
- Scoop up herb powder with the larger half of the capsule by dragging it through the powder on your plate, pressing gently to pack it.
- Fill the smaller half as well.
- Join the two halves together, pressing firmly until they click into place.
- Store finished capsules in a dark glass jar, tightly sealed, away from heat and moisture.
With a capsule filling machine: these inexpensive tools (typically under $20) allow you to fill a tray of capsules simultaneously, dramatically cutting down on time and mess if you make capsules regularly.
Dosage Considerations
Capsule dosage depends on the herb and the size of the capsule. A size "00" capsule holds approximately 500 to 800mg of powder, depending on the density of the herb. Typical doses for well-known herbs run from 500mg to 2,000mg per dose, taken one to three times daily. The Herbalist's Codex includes dosage information for each herb in our database.
Shelf Life of Herb Powders
Powdered herbs have a shorter shelf life than whole dried herbs, because grinding increases the surface area exposed to air and light, which accelerates degradation. Store powders in airtight, dark containers and aim to use them within 6 to 12 months of purchase or grinding. Smell and colour are your best indicators of freshness: a vibrant colour and characteristic scent mean the powder is still good; a dull, flat, or off smell suggests it has passed its prime.
Herbs Commonly Used in Capsule or Powder Form
- Valerian root: practically the poster herb for capsules, given its powerful and polarising scent
- Ashwagandha: a popular adaptogen that is widely available in powder form and has a mild, slightly earthy taste that blends easily into foods and drinks
- Turmeric: frequently taken as a capsule or added to foods; best absorbed alongside a small amount of black pepper and a fat
- Slippery elm: the powder has a soothing, mucilaginous quality and is often mixed into liquids or porridge
- Spirulina and chlorella: technically algae rather than herbs, but taken in exactly the same powder or capsule form and commonly found alongside herbal powders in practice
A Note on Quality and Sourcing
Powders are the preparation form where sourcing matters most, because adulteration (dilution with inferior material) is easier to hide in a powder than in a whole herb. Buy from reputable suppliers who provide batch testing, clear botanical names, and country of origin information. The Herbalist's Codex database notes quality indicators and sourcing considerations wherever they are relevant.