How to Navigate Stability Challenges of NHPs in Gummy Formats

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The natural health product (NHP) industry continues to expand with new innovations and active ingredients. At the same time, the dosage forms used to deliver these ingredients are evolving. In recent years, gummies have become an increasingly popular format, combining NHP benefits with convenience and a wide range of flavour profiles. 

However, despite strong consumer preference, gummies are not always the most suitable format for active-ingredient delivery. If formulated incorrectly, they can compromise ingredient stability, shorten shelf life, and reduce overall product performance. These risks stem from characteristics inherent to gummies, including moisture sensitivity, ingredient degradation, and microbial susceptibility. 

Because of these inherent stability challenges, well-designed stability programs and testing are essential for gummy NHPs. They support shelf life, substantiate health claims, maintain product quality, and demonstrate regulatory compliance. 

Regulatory Framework for NHP Stability in Canada 

NHPs are regulated under the Natural Health Products Regulations, which establish the requirements for market entry in Canada. As part of these requirements, manufacturers and other responsible parties must define and maintain product specifications, including a scientifically supported shelf life, to ensure products remain safe, effective, and of consistent quality throughout their lifecycle. 

Common Gaps in Stability Testing 

A common compliance gap is the stability data used to substantiate the product’s shelf life. Stability studies must evaluate the final formulation in its finished dosage form and market packaging, generating evidence that supports the labelled expiry date and storage conditions while demonstrating that the product maintains its quality and potency under real-world conditions. 

Health Canada Good Manufacturing Practices (GMP) Guidance Expectations 

Stability programs for NHPs are not treated as a supporting activity. Under Natural Health Products Regulations and associated Good Manufacturing Practices (GMP) guidance, they are a core component of demonstrating that a product remains compliant throughout its lifecycle. Health Canada expects these programs to be structured, evidence-based, and reflective of the specific risks associated with the formulation, particularly for more complex dosage forms such as gummies. 

Why NHP Gummies Present Unique Stability Challenges 

Gummy dosage forms introduce a distinct set of stability risks that are not typically observed with conventional solid formats such as tablets or capsules. Their composition, which combines water, sugars, gelling agents, and active ingredients within a semi-solid matrix, creates a more reactive environment that can accelerate both physical and chemical degradation. As a result, stability programs for gummies must be more deliberate, with greater emphasis on environmental controls, formulation design, and packaging selection. 

High Water Activity and Moisture Sensitivity 

Gummies inherently exhibit higher water activity, which increases susceptibility to microbial growth, particularly yeast and mould. This moisture content also affects physical stability, often leading to texture changes over time, such as hardening, deformation, or surface stickiness. These changes can impact not only product quality but also consumer acceptability and dose uniformity. 

Active Ingredient Degradation 

Many vitamins commonly incorporated into gummy NHPs exhibit inherent chemical instability within this matrix. Vitamin C is particularly susceptible to oxidative degradation, while several B vitamins demonstrate sensitivity to heat and light. Fat-soluble vitamins, including A, D, and E, are also prone to oxidation and may interact with surrounding excipients. As a result, potency loss over time is a recognized formulation challenge and must be addressed through stability data and, where appropriate, scientifically justified overages. 

Matrix Interactions 

The gummy system itself contributes to instability through interactions between its components. Gelatin or pectin bases, combined with sugars and acids, can influence the stability of active ingredients by altering pH, moisture distribution, and chemical reactivity. These interactions may lead to uneven degradation across the product, complicating efforts to maintain consistent potency and quality throughout shelf life. 

Environmental Sensitivity 

Gummies are particularly sensitive to environmental conditions encountered during storage and distribution. Temperature fluctuations can significantly impact both texture and the rate of chemical degradation, while exposure to light may further compromise certain active ingredients. These sensitivities reinforce the need for well-controlled storage conditions and packaging systems that provide adequate protection under real-world conditions. 

Key Components of a Compliant Stability Program and Shelf Life Establishment for Gummy NHPs 

A compliant stability program for gummy NHPs begins with a defined protocol outlining study objectives, including shelf life determination and label claim verification, while accounting for formulation-specific risks such as moisture sensitivity and ingredient degradation. The program should include representative batches, final packaging configurations, and justified storage conditions that reflect real-world use. Stability programs typically include long-term conditions representative of the Canadian climate, with accelerated conditions often incorporated to assess degradation trends and support early shelf life decisions. 

Testing Parameters and Intervals for Gummy Matrices  

Testing should be tailored to the unique characteristics of gummy formats and include physical assessments such as texture, firmness, stickiness, and appearance, alongside chemical testing for potency and degradation products, and microbiological testing including total counts and yeast and mould. Parameters must align with applicable regulatory requirements and any pharmacopeial standards attested to during product licensing. Stability should be evaluated at predefined intervals, typically including initial, 3, 6, 12, and 24 months, with additional early time points often warranted for gummies. Any reduced testing schedule must be scientifically justified. 

Use of Stability Data and Shelf Life Assignment  

Stability data must be translated into a defensible shelf life that reflects real-world product performance. Health Canada places primary reliance on real-time stability data to establish expiry dates, while accelerated studies may support preliminary shelf life assignments and help identify degradation pathways. However, accelerated data alone is generally insufficient without ongoing real-time confirmation. Where necessary, overages may be used to account for expected potency loss, provided they are scientifically justified and controlled. 

Packaging Considerations for Gummy Formats 

Packaging is a critical determinant of shelf life for gummy NHPs. Barrier properties must limit moisture ingress and oxygen exposure to preserve both physical integrity and chemical stability. Common solutions include HDPE bottles with desiccants and specialized blister systems, with the selected configuration required to align with the stability data supporting the product’s expiry date. 

Common Stability Pitfalls for Gummy NHPs 

Despite the availability of clear regulatory expectations, stability programs for gummy NHPs frequently present gaps that can delay product licensing or result in GMP observations. These issues often stem from applying conventional stability approaches without fully accounting for the unique sensitivities of gummy formulations, particularly in relation to moisture, packaging, and environmental exposure. 

Final Remarks: Stability as a Strategic Compliance Function for Gummy NHPs 

Stability for gummy NHPs requires a more deliberate and technically rigorous approach than many conventional dosage forms. Their sensitivity to environmental conditions and formulation variability introduces a narrower margin for error, making precision in study design and interpretation essential. 

Proactive planning is therefore critical. Stability should be embedded early in product development and aligned with formulation, packaging, and market conditions from the outset, rather than addressed reactively after issues emerge. 

A well-executed stability program ultimately serves as a core compliance function. It supports defensible expiry dating, reduces regulatory risk, and ensures continued alignment with GMP expectations over the product lifecycle. 

 

Supporting Your Gummy NHP Stability 

Stability for gummy NHPs requires a level of technical and regulatory alignment that extends beyond standard program design. From formulation through to packaging and shelf life assignment, each element must be supported by data that withstands Health Canada review and ongoing GMP scrutiny. 

SNI supports manufacturers and importers with stability programs that are built for compliance and long-term performance. This includes protocol design, shelf life justification, overage strategy, packaging alignment, and GMP gap assessments, as well as oversight of foreign-generated data for Canadian market entry. Our approach is structured, practical, and aligned with regulatory expectations, ensuring your stability program supports both approval and sustained compliance.

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