Softgel capsules are one of the most popular dosage forms in the dietary supplements industry due to their excellent bioavailability, attractive appearance, and consumer-friendly swallowing experience. However, one of the most common challenges faced by softgel manufacturers is softgel leaking oil during production, storage, or transportation.

Oil leakage not only affects product appearance and shelf life but can also lead to customer complaints, regulatory risks, and significant financial losses. In this article, we will discuss the main causes of softgel leakage and practical solutions to prevent leaking problems in supplements manufacturing.

What Causes Softgel Capsules to Leak Oil?

Softgel leakage can occur for multiple reasons, including formulation issues, encapsulation parameters, shell quality problems, and improper storage conditions. Understanding the root cause is essential for effective troubleshooting.

1. Poor Gelatin Shell Formulation

The gelatin shell acts as the protective barrier for the fill material. If the shell formulation is not properly balanced, the softgel may become too soft, brittle, or weak.

Common shell formulation problems include:

• Incorrect gelatin-to-plasticizer ratio

• Low bloom strength gelatin

• Excessive moisture content

• Poor-quality raw materials

• Insufficient shell elasticity

2. Incompatible Fill Materials

Certain active ingredients or oils may interact with the gelatin shell and weaken it over time.

Examples include:

• Low molecular weight PEGs

• Volatile oils

• Acidic ingredients

• Hygroscopic materials

• Solvents that migrate into the shell

These ingredients can soften or dissolve the gelatin shell, eventually causing leakage.

3. Improper Sealing During Encapsulation

Softgel sealing quality is critical. Weak seams can easily crack or leak under pressure.

Possible causes include:

• Incorrect wedge temperature

• Poor ribbon thickness control

• Low die roll pressure

• Misaligned equipment

• Inconsistent encapsulation speed

4. Drying Process Problems

Improper drying is another major reason for leaking softgels.

If capsules are overdried:

• Shells become brittle and crack

If capsules are underdried:

• Excess moisture weakens seams

• Capsules deform during storage

5. Storage and Transportation Conditions

Environmental conditions can greatly impact softgel stability.

High temperature and humidity may:

• Soften gelatin shells

• Increase oil migration

• Cause capsules to stick together

• Lead to leakage during shipping

How to Prevent Softgel Leakage Problems

Professional softgel manufacturers use strict formulation design, process control, and quality management systems to minimize leakage risks.

Optimize Gelatin Shell Formula

A stable shell formulation is the foundation of high-quality softgels.

Key optimization strategies include:

• Using high-quality pharmaceutical-grade gelatin

• Adjusting plasticizer ratios properly

• Controlling shell moisture levels

• Improving shell elasticity and tensile strength

• Conducting compatibility studies before production

Modern supplements manufacturers may also use vegetarian softgel alternatives such as modified starch or carrageenan systems for specific formulations.

Carefully Evaluate Fill Formulation Compatibility

Before mass production, manufacturers should perform compatibility testing between the fill material and shell.

Recommended testing includes:

• Accelerated stability studies

• Migration testing

• Heat resistance testing

• Long-term shelf-life evaluation

Using antioxidants and stabilizers may also help reduce oxidation and oil migration.

Maintain Proper Encapsulation Parameters

Precise machine settings are essential for leak-free softgel production.

Critical process controls include:

• Wedge temperature control

• Gel ribbon thickness consistency

• Accurate fill weight

• Proper die roll alignment

• Seam strength monitoring

Experienced operators and automated inspection systems can significantly reduce defects.

Improve Drying System Management

Drying conditions should be carefully monitored throughout production.

Best practices include:

• Controlling drying room temperature and humidity

• Using multi-stage drying systems

• Rotating drying trays evenly

• Monitoring residual moisture content

• Avoiding excessive airflow

A balanced drying process helps maintain optimal shell flexibility and sealing strength.

Use High-Quality Packaging

Packaging plays a crucial role in protecting softgel capsules.

Recommended packaging solutions include:

• Aluminum blister packs

• HDPE bottles with desiccants

• Moisture-barrier containers

• Temperature-resistant packaging materials

Proper packaging reduces environmental stress during transportation and storage.

Importance of Quality Control in Softgel Manufacturing

Strict quality control is essential to prevent oil leakage problems before products reach the market.

Professional supplements manufacturers should implement:

• Incoming raw material inspection

• In-process quality monitoring

• Leak testing procedures

• Stability testing

• Finished product inspection

• GMP-compliant manufacturing systems

Regular equipment maintenance and staff training are also critical for maintaining consistent product quality.

Why Choose an Experienced Softgel Manufacturer?

Choosing a professional supplements contract manufacturer can significantly reduce production risks and improve product stability.

An experienced softgel manufacturer can provide:

• Advanced encapsulation technology

• Customized formulation support

• Stability testing services

• GMP-certified production facilities

• International compliance standards

• Strict quality assurance systems

For supplement brand owners, partnering with a reliable manufacturer helps ensure product quality, customer satisfaction, and long-term brand reputation.

Final Thoughts

Softgel leaking oil problems can negatively impact supplements quality, appearance, and market performance. However, with proper formulation design, equipment control, drying management, and quality assurance, manufacturers can effectively minimize leakage risks.

As consumer demand for high-quality dietary supplements continues to grow, maintaining stable and leak-free softgel products is more important than ever. Working with a professional and experienced supplements manufacturer is one of the best ways to ensure reliable softgel production and long-term business success.