Are you starting a capsule filling factory? Well, you need to choose the right capsule for your products.
Apart from knowing capsule sizes, you must know what material they are made of, dissolution, and classification, among other vital aspects. In this article, we will explore 15 capsule types, you can choose for your product.
Common Types of Capsules
1. Hard Gelatin Capsules
Hard gelatin capsules are made of firm two-piece animal-gelatin based shells. You select them whenever your actives require rapid release and stable environments. Their transparency allows you to manufacture in large quantity with effectiveness and accuracy.
Benefits
- Rapid release: The hard gelatin shells easily disintegrate releasing your actives immediately.
- Consistent shape: Capsules retain shape providing you with consistent protection from dry material.
- Cost-effective: You save on production because gelatin capsules are inexpensive and easily available.
Disadvantages
- Animal-based: You cannot use them for vegetarian or vegan manufacturing.
- Heat-sensitive: Gelatin is a heat-sensitive material and can melt very easily, so you need to keep it stored in cold, dry conditions.
- Moisture absorption: It is hygroscopic, so it will impact your capsule shelf stability
2. Soft Gelatin Capsules (Softgels)
Soft gelatin capsules are a plasticized single-piece shell of gelatin. You depend on them to encapsulate suspensions, oils, and semi-solids. They enable you to deliver actives that are inactive in dry states.
Benefits
- Perfect for oils: Soft gels successfully encapsulate oily actives without leakage.
- Easy swallowing: Their smooth texture is easy to swallow.
- Deliver actives at specific times: You can control the shell to release ingredients on a timed or delayed schedule.
Limitations
- Animal-derived: They are not the ones to use if you require a vegetarian capsule.
- Heat-sensitive: They melt when exposed to heat and thus must be stored under refrigerated conditions.
3. HPMC Capsules (Vegetarian Capsules)
HPMC (Hydroxypropyl Methylcellulose) capsules come from pine or cotton cellulose. You use them if you need plant shells that can stand heat and humidity. HPMC capsulegives you a strong shell for sensitive actives.
Pros
- Vegan-friendly: They are ideal for plant-based manufacturing.
- Humidity stable: They do not break down quickly in wet or humid environments.
- Compatible with actives: HPMC works well with dry and semi-solid actives.
Limitations
- More expensive: You pay more than traditional gelatin.
- Delayed disintegration time: Your actives may take longer to be released than gelatin.
- Becomes brittle in dry air: The capsules turn brittle and crack when exposed to dry air if not stored correctly.
4. Pullulan Capsules
Pullulan capsules are manufactured from fermented tapioca and are completely plant-derived. You opt for them if you prefer clean-label, clear capsules without any artificial content. Their transparency allows you to show your contents in an appealing way.
Benefits
- Vegan-friendly: Pullulan is the way to go if you’re staying away from all animal derivatives.
- Clear visibility: It gives you a transparent shell that creates a premium product look.
- Low oxygen permeability: It protects your actives by reducing exposure to air and oxidation.
Limitations
- Higher material cost: You pay more due to its fermentation-based production.
- Limited popularity: You may face sourcing issues since it’s less widely used than gelatin.
- Not oil-compatible: It doesn’t work well with oily actives, which limits your formulations.
5. Enteric-Coated Capsules
Enteric-coated capsules contain a unique outer coating that is not dissolved by stomach acid. You rely on them to keep your actives safe until they get to the intestines, where they are better absorbed. This coating helps you deliver ingredients exactly where they work best in the body.
Advantages
- Acid protection: Your actives stay intact as they move through the stomach. The coating prevents acid from damaging your formula.
- Targets intestines: You release actives only where absorption or action is most effective. This works best when your results depend on gut activity, not the stomach.
- Great for enzymes: These capsules keep ingredients like enzymes and probiotics stable in harsh environments. This ensures they stay effective until the right moment.
Limitations
- Extra processing: You need an additional coating step that complicates manufacturing. This slows your process and adds to your cost.
- Sensitive to heat: The coating can break down at high temperatures. You need careful storage and handling.
- Slower onset: You delay ingredient release, so effects take longer. That makes them unsuitable when fast action is required.
6. Liquid-Filled Hard Capsules (LFHC)
They are two-piece capsules that can keep liquids or semi-liquids within a sealed shell. You use them when your product contains oils, suspensions or sensitive actives. They bring liquid flexibility along with the convenience of hard capsule filling.
Benefits
- Liquid compatibility: You successfully deliver oily or insoluble actives.
- Accurate dosing: The capsule provides you with dosage with utmost precision.
- Sealed for security: You cut out contamination and leakage with cutting-edge seals.
Drawbacks
- Complex sealing: You require special equipment to seal them effectively.
- Higher production cost: Fluid filling increases your cost and production time.
- Not ideal for powders: These capsules are not suitable for dry products.
7. Delayed-Release Capsules
Delayed-release capsules delay ingredient release until they reach the intestines. You utilize them when your actives degrade in stomach acid or perform better later. Their unique coating provides you with controlled, precise timing.
Advantages
- Timed delivery: It ensures actives don’t release until after stomach exit.
- Increased bio-availability: These capsules protect ingredients from harsh stomach acids.
- Perfect for probiotics: These capsules preserve live bacteria until gut arrival.
Drawbacks
- Increased expense: Tests and coatings add to your cost of production.
- Ingredient limits: Some actives will not survive coating.
- Slower effects: You might not achieve quick results due to delayed release.
8. Sustained-Release Capsules
Sustained-release capsules deliver actives slowly over time through a timed mechanism. You depend on them to keep ingredients active inside the body for extended hours. These capsules help you lower the number of doses while offering consistent effects.
Advantages
- Extended delivery: Your actives release slowly over hours. You reduce frequent dosing with long-lasting support.
- Stable levels: You maintain steady ingredient levels in your system. This improves results and avoids spikes.
- Great for long treatments: You gain better outcomes when treating long-term issues like pain or fatigue.
Limitations
- Complex development: You need precision to build the right time-release profile. That adds testing steps.
- Higher production cost: Timed-release capsules require specialized ingredients and longer development. This increases your expense on the production.
- Delayed effects: You don’t get fast relief. The release begins slowly, so immediate results aren’t possible.
9. Dual-Chamber Capsules (Capsule-in-Capsule)
This capsule type contains another capsule inside a larger shell. You choose it when your formula needs ingredient separation until delivery. It allows you to combine complex actives without compromising their effectiveness.
Advantages
- Ingredient separation: It keeps actives apart until release. You avoid unwanted reactions or instability.
- Timed release: Each chamber can release at different stages. You benefit from better control and precision.
- Mixed format support: It holds both liquids and powders. You expand what you can formulate.
Drawbacks
- Hard to manufacture: It requires sophisticated equipment. You encounter greater production complexity.
- Costlier: It consumes additional materials and labor. This raises your total cost.
- Greater size: It’s larger than regular capsules. You may experience difficulty swallowing.
10. Effervescent Capsules
Effervescent capsules break down by a fizzing mechanism the moment they are exposed to liquids. You apply them whenever you want to feel immediate effects and an improved process of consumption. The fizz allows you to swallow substances immediately and with minimal effort.
Advantages
- Fast release: The capsule fizzes in a liquid and breaks down quickly. Absorption of ingredients is immediate.
- Improved flavor: The capsule contains a good flavor to mask unpleasant tastes. This creates a less bumpy experience.
- Improved absorption: When broken down, it provides greater surface contact. So, you get more absorption of the ingredients.
Drawbacks
- Moisture sensitive: It degrades very quickly in moist conditions. Therefore, you should store it somewhere dry.
- Hostile to sensitive materials: Some actives are broken down with foam. You cannot manufacture it with some chemicals.
- High production cost: It requires unique ingredients and packaging. Therefore, you pay more when you produce.
11. Starch Capsules
These capsules are used when animal-derived ingredients are to be avoided. With shells that degrade naturally, they ensure your delivery system is eco-friendly and green.
Benefits
- It is vegetarian-friendly: Starch capsules keep your production completely plant-based with no animal-derived ingredients held within.
- Biodegradable: Capsule breaks down naturally, thus preventing environmental hazards.
- Neutral taste: Avoids strong taste, allowing full emphasis on the active agents.
Drawbacks
- Less stable: They need to be handled with care as they react to heat and moisture.
- Shorter shelf life: These capsules demand special storage for preventing degradation.
- Harder to produce: The greater complexity that these capsules bear may limit your accessibility or simply increase your costs.
12. AR-Caps (Acid-Resistant Capsules)
AR-Caps are resistant to stomach acid, allowing your active ingredients to reach the intestines undamaged. You rely on these capsules to keep your delicate ingredients away from harsh stomach environments. AR-Caps deliver your actives where they will have the greatest effect, in your intestines.
Benefits
- Preserves sensitive actives: AR-Caps keep your sensitive actives from being destroyed by stomach acid, thus retaining their potency.
- Releases at the right place: Intestines are where AR-Caps release the actives, hence allow for more efficient absorption.
- Safe for probiotics: AR-Caps protect live probiotics to remain active throughout digestion and deliver them into your gut.
Limitations
- Need for special coatings: AR-Caps depend on specialized coatings that restrict your choice of ingredients and make production more difficult.
- Costlier to produce: The specialized coatings and testing involved in the manufacture of AR-Caps make production more expensive.
- Inappropriate for some actives: Some ingredients, mainly those that are temperature-sensitive, cannot be utilized with AR-Caps due to their coating process.
13. Chewable Capsules
Chewable capsules belong to soft gel capsules and are given to ease the intake of supplements. These capsules come into use when swallowing solid capsules is difficult for target users. They provide a pleasant, user-friendly experience that requires no water.
Advantages
- Easy to take: The capsule being chewable provides a suitable alternative for those who find it hard to swallow.
- Improves compliance: The fact that it is chewable dictates that chances of actual consumption may be higher.
- Masking bad taste: It allows for masking bad flavors with a pleasant one.
Limitations
- Limited to certain actives: It is only suitable with a few active ingredients, which leaves you with formulation limits.
- Costlier to produce: Production costs increase because it requires additional processes and flavoring.
- Shorter shelf life: Being that it is chewable, it also calls for careful storage.
14. Twist-Off Capsules
These are special capsules that open when the top is twisted off. You use the capsule when your product needs direct dispensing of liquid or powdered content. The capsule lets you dispense with precision in a controlled manner on a large-scale production.
Advantages
- Precise dosage: It allows you to accurately control the amount of product dispensed.
- Easy to use: All you have to do is twist off the cap and apply the contents.
- Best for oils and powders: Mostly suitable for oils or powders, thus complementing your line of products.
Limitations
- Hard to manufacture: Twist-off action increases complexity, thus slowing your rate of production.
- Not suitable for all formulations: It eliminates a lot of options in terms of formulation.
- Careful storage required: It needs careful packaging to prevent contamination owing to open-end structure.
15. Gastro-Retentive Capsules
Gastro-retentive capsules remain for an extended time in the stomach and release their content slowly. Gradual release of ingredients gives your body enough time to absorb the drug at the right place. Thus, you enjoy longer effects without taking multiple doses.
Advantages
- Improved retention: The capsule stays longer in your stomach to enable better absorption.
- Released under control: It releases ingredients gradually, giving your body consistent outcomes.
- Less dosing: You require less doses since the effect remains long.
Disadvantages
- Not suitable for all drugs: These actives are not to be used with drugs that dissolve too quickly in stomach acid.
- Special design required: Floating or an expansible capsule is needed for retention in the stomach.
- More development time: More time and energy are utilized in the design and testing of these capsules.
Conclusion
Clearly, there are many types of capsules you can choose for your products. All these capsules come in different sizes, colors and material formulated for specific uses.
At SaintyCo we supply different capsule filling machines and empty capsules. Depending on your production requirements, we offer a complete filling solution – send inquiry now.
