In the modern nutraceutical and pharmaceutical landscape, consumer demand for "Clean Label" products has evolved. Today, clean label is no longer just about avoiding synthetic colorants or gelatin—it is about formula purity. Consumers and healthcare practitioners increasingly demand supplements free of bulk excipients, flow agents, and unnecessary filler powders like microcrystalline cellulose or lactose.
However, for formulation scientists, removing bulking agents presents a significant physical dilemma: How do you package a micro-dose of a high-potency active ingredient without using extra fillers?
When an active pharmaceutical ingredient (API), specialized probiotic strain, or highly concentrated botanical extract requires a dosage of only 50 mg to 100 mg, filling it into a standard #0 or #00 capsule requires filling up to 80% of the space with inert fillers.
The solution lies in Size 5 micro capsules. Featuring a compact volume of just 0.13 mL and a locked length of 11.1 mm, Size 5 capsule shells allow formulators to achieve 100% pure, filler-free micro-dosing.
1. Eliminating Fillers in High-Potency Actives
Using standard large capsules for tiny dosage weights forces brands to dilute their formulations. Size 5 micro capsules provide a direct match between raw active powder mass and physical shell capacity.
- Pure Actives Protection: Eliminates the need for bulking fillers, reducing potential chemical interactions between excipients and sensitive active molecules.
- Cost Efficiency on Excipients: Savings on high-purity pharmaceutical-grade fillers while elevating product positioning to a premium "100% Active Ingredient" status.
- Optimal for Hygroscopic Actives: Offered in both Plant-Based Veggie (HPMC) with low moisture content (4.0%–7.0%) and Pure Gelatin (rapid gastric disintegration), ensuring stability for sensitive botanicals and microbial cultures.
| Target Active Dose | Size 00 Capsule Option | Size 0 Capsule Option | Size 5 Micro Capsule Solution |
|---|---|---|---|
| 50 mg – 80 mg Active Powder | Requires ~85% Bulking Filler | Requires ~80% Bulking Filler | 100% Pure Active (Zero Filler) |
| 100 mg – 130 mg Active Powder | Requires ~80% Bulking Filler | Requires ~70% Bulking Filler | Exact Fit Volumetric Fill |
| Clean Label Position | High Excipient Count | Moderate Excipient Count | Ultra-Clean / Single Ingredient |
2. Capsule-in-Capsule (CIC) Multi-Phase Technology
Beyond single-ingredient micro-dosing, Size 5 capsules serve as a crucial technical component in advanced pharmaceutical delivery systems—specifically Capsule-in-Capsule (CIC) dual-release technology.
When R&D teams need to combine two incompatible actives (e.g., live probiotic strains and liquid omega-3 oils) or create a dual-stage release profile (immediate release + delayed release), Size 5 provides the ideal internal core:
- Physical Isolation: The inner Size 5 capsule houses sensitive powder actives or fast-dissolving compounds.
- Outer Core Shell: The inner Size 5 capsule is encapsulated inside a larger #00 or #000 outer capsule filled with liquid oil or acid-resistant enteric beads.
- Targeted Delivery: Protects inner actives through gastric passage until reaching the target absorption site in the small intestine.
| Formulation Challenge | Traditional Packaging Workaround | Size 5 Capsule Innovation |
|---|---|---|
| Incompatible Active Ingredients | Two separate pills per serving | Inner Size 5 in Outer #00 (Dual-in-One) |
| Hygroscopic Powder Hydrolysis | Heavy synthetic desiccant packs | Low-Moisture HPMC Size 5 Barrier |
| Clinical Trial Blind Testing | Inconsistent custom compounding | Uniform 0.13 mL Precision Dosing Shell |
3. OEM Machine Performance & Production Stability
A common concern among contract manufacturers (OEMs) when adopting miniature capsules is line speed and filling stability. Because Size 5 capsules have a small diameter (4.91 mm), poor manufacturing tolerances can lead to sorting errors or cap deformation.
EEK engineers manufacture Size 5 HPMC and Gelatin capsules under rigorous dimensional quality controls:
- Uniform Wall Thickness: Prevents crushing during vacuum orientation and high-speed sorting.
- Engineered Locking Mechanism: Features dual locking rings to prevent premature opening or leakage on automated filling machinery.
- Optimized Tooling Support: Compatible with standard semi-automatic and fully automatic encapsulators fitted with Size 5 changeover parts.
Looking for Veterinary or Pediatric Dose Solutions?
Discover how EEK Size 5 micro capsule shells solve severe compliance challenges in pet supplement administration and pediatric pharmaceutical delivery.
Read Full Application Guide →Strategic Supply Chain: Regional Stock in LA, Vancouver, Toronto, & Sydney
Specialized micro capsules like Size 5 are often hard to source with short lead times. EEK supports brand agility with dedicated regional inventory and hassle-free global shipping.
Local Distribution Network:
- Los Angeles, USA: Primary US warehousing for rapid West Coast fulfillment.
- Vancouver & Toronto, Canada: Dual-warehouse coverage across Eastern and Western Canadian hubs.
- Sydney, Australia: Local inventory supporting the ANZ and Asia-Pacific healthcare sectors.
Global DDP (Delivered Duty Paid) Door-to-Door Logistics:
EEK manages customs clearance, import tariffs, duties, and final delivery directly to your facility. You receive ready-to-fill Size 5 capsules with zero logistical friction or unexpected import charges.
Partner with EEK for Micro-Dosing Excellence
Whether you are developing a filler-free Clean Label supplement or designing a complex multi-phase delivery system, EEK Size 5 Plant-Based HPMC and Gelatin capsules offer the ultimate precision platform.
Ready to evaluate Size 5 capsules for your R&D pipeline?
Contact the EEK technical team today to request free sample kits, Certificate of Analysis (COA) documents, and machine setup specifications.
📩 Contact EEK Team: [Click Here to Fill Out Sample Request Form] / Email us at [kevin@eekpharma.com]
📞 Direct Phone: [+86 13561623550]