Why Capsules Are the Gold Standard
Capsule supplements are the most trusted format on the market. They let herbal actives shine without the bitter taste that turns consumers away. They enable precise dosing — you know exactly how much active is in each dose. And they look professional, which builds confidence in your brand.
Whether you're formulating your first supplement or scaling to commercial production, understanding capsule basics is essential. This guide walks you through everything from capsule sizing to fill weight calculations to working with manufacturers.
Capsule Basics: Size, Material & Fill Weight
Capsule sizes are standardized. The most common are:
- Size 00 (double zero): 600mg fill capacity — the sweet spot for most supplements
- Size 0 (zero): 450mg fill capacity — good for higher-potency formulas
- Size 000 (triple zero): 900mg fill capacity — for large-dose formulas, but harder to swallow
- Size 1: 300mg fill capacity — ideal for small servings or children's formulas
You'll also choose between two capsule types: gelatin (traditional animal-derived, widely used, affordable) and vegetable (HPMC) (plant-based, better for vegan markets, slightly more expensive). Modern natural brands increasingly use veggie capsules to appeal to a broader consumer base.
Pro tip: Size 00 capsules dominate the market because they're easy to swallow, hold a generous dose, and feel substantial to consumers. If you're unsure, start here.
Understanding Fill Weight vs. Active Dose
A crucial concept that confuses many first-time formulators: fill weight is not the same as active content. A size 00 capsule has a 600mg fill weight — but that weight refers to the capsule's capacity when packed with that specific ingredient.
Different powders have different densities. Mineral powders pack tightly. Fluffy plant powders like slippery elm bark take up more space. So when you fill a capsule with ashwagandha root powder at 600mg, you're getting 600mg of root powder, but the active withanolide content depends on the herb's potency and whether it's a whole powder or standardized extract.
This is why standardized extracts are powerful: they're concentrated. A 5% withanolide ashwagandha extract means every 100mg contains 5mg of active withanolides. You can hit your target dose with much less volume.
Extracts vs. Whole Herb Powders
You have two main ingredient routes:
Standardized extracts are processed plant materials with a guaranteed minimum percentage of active compounds. A KSM-66 ashwagandha extract is standardized to 5% withanolides. Extracts are more potent per mg, cost more per kg, and require less capsule volume to achieve your dose. They're the choice for professional brands targeting efficacy.
Whole herb powders are simply dried and ground plant material. They're less concentrated, cheaper, and carry more of a "whole plant" appeal. They take up more capsule volume — you might need 400–500mg of whole ashwagandha powder where you'd only need 200mg of extract to hit the same withanolide dose.
Most commercial brands blend both: a core of standardized extract for potency, supported by whole herb powder for synergy and full-spectrum feel.
Popular Capsule Formula Categories
The market has clear winners in supplement categories. Stress and adaptogen blends (ashwagandha, rhodiola, holy basil) dominate because anxiety and burnout resonate deeply. Sleep formulas with valerian, passionflower, and magnesium sell year-round. Immune support blends (echinacea, elderberry, vitamin C) spike seasonally. Nootropic formulas with lion's mane, bacopa, and ginkgo appeal to focus-hungry professionals. Digestive blends with ginger, triphala, and slippery elm support gut health.
Pick a category you believe in and understand deeply. Your authenticity shows in the formulation.
Sample Formula: The Calm Stack Capsule
Here's a real example of a balanced stress-support capsule:
| Ingredient | Amount per Capsule | Cost per Capsule |
|---|---|---|
| Ashwagandha KSM-66 Extract (5%) | 300mg | $0.38 |
| L-Theanine | 100mg | $0.12 |
| Lemon Balm 4:1 Extract | 100mg | $0.16 |
| Magnesium Glycinate | 50mg | $0.06 |
| Size 00 Vegetable Capsule | 1 | $0.04 |
| Total per Capsule | 550mg | $0.76 |
| Cost per 60-count bottle | 60 capsules | $45.60 |
This formula totals 550mg, leaving 50mg headroom in a size 00 capsule for flow agents or binding. It delivers complementary actives: ashwagandha for stress resilience, L-theanine for calm focus, lemon balm for mild sedation, and magnesium for nervous system support.
Equipment for Small-Batch Encapsulation
If you're starting with small batches (500–1000 capsules), you don't need industrial equipment. A basic manual capsule machine, a digital scale accurate to 0.1g, and a clean workspace suffice:
- 100-hole capsule machine (size 00) — $25–45
- Digital scale (0.1g precision) — $15–30
- Capsule tamper/press tool — $5–15
- Stainless steel bowls and spoon — $15
- Fine powder sifter — $8–12
- Dust mask and clean workspace — essential
Total investment: $100–150 for equipment to fill 500–1000 capsules at a time.
Step-by-Step Encapsulation Process
Weigh and Sift All Ingredients
Measure each ingredient to the exact weight required for your batch. Sift powders through a fine mesh to remove lumps and improve flow. Poor flow leads to inconsistent fill weight.
Blend Thoroughly
Combine all ingredients in a bowl and blend using a figure-8 mixing pattern for 5 minutes. This ensures even distribution. Uneven blending means some capsules get too much of one ingredient.
Load Capsule Machine Bottom Half
Place the longer bottom half of empty capsules into the machine. Fill the capsule machine hopper with your blended powder.
Fill with Powder
Slide the powder hopper across all capsules to distribute powder into each one. The capsules will be slightly overfilled — this is correct.
Tamp to Seat Powder
Use the tamper plate to press the powder down, seating it firmly in the capsule. This removes air pockets. Fill slightly over the top again.
Close Top Half
Slide the top halves of capsules into place over the filled bottom halves. Press the closing plate to join them together. Now all capsules are sealed.
Polish Capsules
Remove the capsules and polish them gently with a soft cloth to remove powder dust. They'll look clean and professional.
Verify Fill Weight Consistency
Weigh 10 random capsules. They should average within 5% of your target weight. If variance is high, your blending wasn't thorough enough.
Ready to Scale?
Co-packing makes sense once you move beyond small batches. We help you find manufacturers and calculate costs.
The Co-Packer Route: From Batches to Bottles
Once you validate your formula with small batches, manufacturing partners become your growth engine. co-packer costss handle blending, encapsulation, bottling, and labeling under GMP standards.
Typical minimums start at 1,000–5,000 capsule units. You provide the formula (ingredient list, amounts, sourcing), they produce, test, and deliver finished bottles. Benefits include GMP certification, third-party testing (Certificates of Analysis), regulatory compliance, and speed. You can focus on marketing while they focus on manufacturing.
Packaging Your Capsules
Packaging signals quality. Most capsule supplements ship in HDPE bottles (brown or white, childproof caps) for durability and protection. 60-count and 90-count are standard retail sizes. Premium brands use glass bottles — they feel more luxurious but cost more and add weight (shipping cost). Pouches with resealable zippers appeal to DTC (direct-to-consumer) brands and reduce unit cost.
Always include a desiccant packet (silica gel) inside the bottle to protect against moisture. Capsules absorb water and become brittle if humidity is high.
Supplement Facts Panel Requirements
The FDA requires a Supplement Facts panel on every dietary supplement bottle. It must list:
- Serving size (e.g., "2 capsules")
- Servings per container
- Each ingredient with the amount per serving
- % Daily Value if it exists (most herbs don't have one)
Your manufacturer's label designer can handle this, but make sure it's accurate and FDA-compliant.
Regulatory Reality: Capsule supplements are dietary supplements under DSHEA (Dietary Supplement Health and Education Act). You cannot make disease claims. "Supports healthy stress response" is legal. "Treats anxiety" is not. Structure/function claims are allowed; disease claims are not.
Pricing Your Capsule Formula
Market pricing for capsule supplements is mature and competitive. A typical 60-count DTC bottle retails for $24–45, depending on formula complexity and brand positioning. wholesale pricings (what retailers pay you) usually run 40–50% of retail, so $12–22 per bottle. High-end nootropic or adaptogen stacks can command $45+ retail.
Your COGS (cost of goods sold) including ingredients, capsules, bottle, label, and basic packaging typically runs $4–8 per bottle at small scale, dropping to $2–4 as you scale and negotiate better ingredient pricing.
Next Steps: From Formula to Market
You now have the knowledge to formulate a capsule supplement from scratch. The path forward: validate your formula with a small hand-filled batch, get feedback from a trusted group, refine based on input, then approach co-packers with a solid formula and positioning. Your authentic story — why you created this formula, what problem it solves — is what ultimately sells it.
Price Your Capsule Formula
Use Formulatr to calculate ingredient costs, batch yields, and retail pricing for your capsule supplement.
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