What is stability testing in simple terms?

It is a structured program of analytical tests performed over time, under controlled storage conditions, to characterize how product quality attributes - like alkaloid content, microbial counts, and appearance - change over shelf life.

ICH Q1A(R2) is the International Council for Harmonisation guideline that specifies the temperature, humidity, and time-point conditions for stability testing. It is the international standard.

What conditions are used for stability testing?

Long-term: 25°C / 60% RH. Intermediate: 30°C / 65% RH. Accelerated: 40°C / 75% RH for six months. Time points include 0, 3, 6, 9, 12, 18, and 24 months for long-term studies.

What is measured in a stability study of a 7-OH product?

Mitragynine and 7-OH percent assay (by HPLC), formation of degradation products (often by LC-MS), microbial counts, and physical attributes such as color, dissolution, and moisture content.

Why does 7-OH require special storage?

Published research identifies photolytic and oxidative degradation pathways for 7-OH. Manufacturers typically use light-protective packaging and recommend cool, dark, dry storage to maximize shelf life.

Does stability data appear on a COA?

A Certificate of Analysis typically reports the percent assay and other quality attributes at the time of release, not the stability profile. Stability data are usually internal product-development data; the labeled expiration or 'best by' date on a finished product is informed by stability studies.

Lab Testing & Quality

Stability Testing

At-a-glance comparison

Spec	Value
Standards reference	ICH Q1A(R2) Stability Testing of New Drug Substances and Products
Long-term storage condition	25°C ± 2°C / 60% RH ± 5% RH
Intermediate condition	30°C ± 2°C / 65% RH ± 5% RH
Accelerated condition	40°C ± 2°C / 75% RH ± 5% RH (for 6 months)
Typical study duration	12 months minimum for shelf-life support; longer for extended claims
What is measured	Alkaloid percent assay, microbial counts, physical attributes (color, dissolution, moisture)
Where it appears	Internal product-development data; informs the labeled expiration or 'best by' date

What is stability testing?

Stability testing is a structured program of analytical measurements performed on a product over time, under controlled temperature and humidity conditions, to characterize how the product's quality attributes change. The fundamental questions stability testing answers are: how long does the active ingredient content remain within specification, and how do other quality attributes (microbial counts, physical appearance, packaging integrity) evolve over storage?

For kratom and 7-hydroxymitragynine products, stability testing characterizes how mitragynine and 7-OH percent-assay values change over time, whether degradation products form, whether microbial counts increase, and how the product behaves at the storage conditions specified on the label.

ICH Q1A test conditions

The international framework for stability testing is ICH Q1A(R2), which specifies the temperature and humidity conditions to be used. Long-term stability is tested at 25°C ± 2°C and 60% RH ± 5% RH, with samples pulled at 0, 3, 6, 9, 12, 18, and 24 months (or longer). Intermediate conditions (30°C / 65% RH) are tested when long-term data are insufficient. Accelerated conditions (40°C / 75% RH for six months) provide an early indicator of stability and inform labeled shelf-life claims.

Climate-zone-specific conditions are used in regions with different ambient climates. ICH Q1A specifies four climate zones (I, II, III, IVa, IVb) with progressively warmer and more humid long-term conditions to reflect the worst-case storage in each region.

What stability testing reveals about 7-OH

Published research on the stability of 7-hydroxymitragynine identifies several degradation pathways, including photolytic and oxidative routes. Stability data inform packaging choices (light-protective bottles or blister packs), recommended storage instructions (cool, dark, dry conditions), and labeled shelf-life claims. The published literature cited on this page covers the analytical chemistry of 7-OH degradation; manufacturer-specific stability data are typically internal and not always disclosed on a Certificate of Analysis.

Common questions about stability testing

What is stability testing in simple terms?: It is a structured program of analytical tests performed over time, under controlled storage conditions, to characterize how product quality attributes - like alkaloid content, microbial counts, and appearance - change over shelf life.
What is ICH Q1A?: ICH Q1A(R2) is the International Council for Harmonisation guideline that specifies the temperature, humidity, and time-point conditions for stability testing. It is the international standard.
What conditions are used for stability testing?: Long-term: 25°C / 60% RH. Intermediate: 30°C / 65% RH. Accelerated: 40°C / 75% RH for six months. Time points include 0, 3, 6, 9, 12, 18, and 24 months for long-term studies.
What is measured in a stability study of a 7-OH product?: Mitragynine and 7-OH percent assay (by HPLC), formation of degradation products (often by LC-MS), microbial counts, and physical attributes such as color, dissolution, and moisture content.
Why does 7-OH require special storage?: Published research identifies photolytic and oxidative degradation pathways for 7-OH. Manufacturers typically use light-protective packaging and recommend cool, dark, dry storage to maximize shelf life.
Does stability data appear on a COA?: A Certificate of Analysis typically reports the percent assay and other quality attributes at the time of release, not the stability profile. Stability data are usually internal product-development data; the labeled expiration or 'best by' date on a finished product is informed by stability studies.

References

International Council for Harmonisation. (2003). ICH Q1A(R2) Stability Testing of New Drug Substances and Products.
Kong WM, Mohamed Z, Alshawsh MA, et al. (2017). Stability of mitragynine in solution.
Park JH, et al. (2025). Long-term stability of 7-OH in tablet matrices.
United States Pharmacopeia. General Chapter Pharmaceutical Stability.

Important safety information:

Products containing 7-hydroxymitragynine (7-OH) are sold for adult use only (21+). These statements have not been evaluated by the U.S. Food and Drug Administration. Products are not intended to diagnose, treat, cure, or prevent any disease. The FDA has raised safety concerns regarding concentrated 7-OH products; consult a qualified healthcare professional before use. Do not operate vehicles or machinery after use. Keep out of reach of children and pets. Laws vary by state, buyers are responsible for knowing applicable law.