Lemon Balm Extract Improves Dog Behavior by 5.4 Points

Melissa officinalis Extract for Dogs Yields a 5.4 Point Behavioral Improvement

A 2025 study of twenty beagles found a significant behavioral change in dogs given a lemon balm extract compared to a placebo. The Melissa officinalis extract group had a mean behavioral score of +2.0, while the placebo group scored -3.4. This 5.4-point difference, measured on a standardized veterinary evaluation grid, provides objective data for an herbal supplement long used for its calming reputation. Led by researchers from Oniris and Nor-Feed SAS, the work identifies specific metabolic shifts in treated dogs, offering a new explanation for how this natural compound may work.

Understanding Canine Anxiety and the Role of Supplements

Animal welfare requires attention to mental state alongside physical health. Psychological stress and anxiety are common in dogs, triggered by events like thunderstorms, separation, or visits to the veterinarian. While behavioral modification and prescription medications are standard treatments, many owners seek supportive, natural options. Dog calming treats and supplements, often containing herbs, amino acids, or milk proteins, aim to provide this support with fewer side effects.

Why Evidence Matters in the Calming Treats Market

The market for pet calming aids is extensive, but not all products are supported by controlled research. Claims often rely on anecdote or extrapolation from human studies. Objective, species-specific evidence is needed to identify which supplements genuinely affect canine physiology and behavior. The 2025 metabolomics study directly addresses this gap by testing a specific extract on dogs and measuring both behavioral and biochemical outcomes.

The 2025 Metabolomics Study: Design and Direct Findings

Scientists led by Roy and Aberkane designed a controlled trial to test a commercial hydro-alcoholic Melissa officinalis extract (MOE). They compared it against its major purified compound (rosmarinic acid, or RA), a known calming milk protein (α-casozepine, or AC), and a placebo.

Objective Behavioral Scoring Shows a Clear Effect

After four weeks of supplementation, a standardized evaluation developed by Oniris assessed each dog’s behavior. The scoring system quantified responses to various stimuli. The placebo group’s average score was -3.4. In contrast, the MOE group averaged +2.0, the RA group +1.4, and the AC group +0.8. The positive scores for all active treatment groups, particularly MOE, indicate a measurable calming effect compared to the negative trajectory of the placebo group.

A Key GABA-Related Metabolite Was Reduced

The researchers also measured 4-hydroxybutyric acid (GHB), a metabolite in the γ-aminobutyric acid (GABA) pathway. GABA is the brain’s primary inhibitory neurotransmitter, and many anti-anxiety drugs target its system. GHB quantity decreased in all supplemented groups versus the control. This reduction suggests the supplements influenced this critical neurochemical pathway, potentially leading to a more relaxed state. Our article “Lemon Balm Extract Calms Dogs, Modifies Brain Metabolites” explores this finding in greater detail.

How Lemon Balm May Work: A New Metabolic Hypothesis

Beyond confirming a behavioral effect, the study’s use of untargeted metabolomics proposed a novel mechanism. This technology analyzes hundreds of small molecules in a biological sample to see which pathways are altered.

Lipid and Bile Acid Metabolism Pathways Were Altered

The MOE supplementation did not just affect the nervous system. It significantly impacted metabolic pathways linked to lipids and bile acids. Rosmarinic acid supplementation changed fatty acid and lipid metabolism, while α-casozepine affected lysine and sphingolipid pathways. This suggests calming supplements may exert effects through broad metabolic regulation, not solely through direct action on brain receptors. The systemic shift in metabolism could contribute to an overall state of reduced physiological stress.

Practical Applications for Dog Owners

For owners considering calming treats, this research offers a framework for informed decision-making.

Evaluating Products Containing Melissa Officinalis

The study used a specific hydro-alcoholic extract at a dose of 200 mg/kg of body weight. When reviewing products, look for Melissa officinalis (lemon balm) on the label. Note that the effective dose in the study is relatively high; a typical treat may contain less. The concentration and formulation of the extract in a commercial product will influence its potency. The presence of rosmarinic acid is a likely indicator of quality, as it was identified as a major active compound.

Integration with a Comprehensive Anxiety Plan

Supplements are best used as part of a multi-faceted approach. For diagnosed anxiety conditions, they should complement, not replace, veterinary behavior plans, training, and environmental management. For example, a comprehensive plan for separation anxiety would combine behavioral techniques with potential supportive supplements. Always discuss any new supplement with your veterinarian, especially if your dog is on other medications, to check for interactions.

Limitations and Considerations of the Current Evidence

The study provides strong preliminary evidence but has limitations. The sample size was twenty dogs, all beagles, a common model in nutritional research. While beagles offer consistency, results may not translate identically to all breeds and individual temperaments. The trial lasted four weeks, showing short-to-medium-term efficacy, but long-term effects and safety beyond this period were not assessed. Furthermore, the study tested a pure extract, not a final commercial treat formulation which contains other ingredients.

How This Research Compares to Other Calming Ingredients

Melissa officinalis is one of several ingredients with research backing. Alpha-casozepine, the milk protein used as a comparator in this study, has its own body of evidence supporting its calming effects through GABA receptor interaction. L-theanine, an amino acid from green tea, and certain probiotics are also being studied for behavioral support. The unique contribution of this metabolomics study is the detailed metabolic map it provides for how lemon balm works, moving beyond simple behavioral observation to propose a systemic mechanism.

Other natural supplements, such as fish oil for dogs, support brain health through different pathways, primarily via anti-inflammatory omega-3 fatty acids. The choice of supplement may depend on the dog’s specific needs and the underlying physiology of its anxiety.

Key Takeaways

• A specific Melissa officinalis (lemon balm) extract produced a measurable calming effect in beagles, improving standardized behavioral scores by 5.4 points versus a placebo after four weeks.
• The study identified changes in the GABA neurochemical pathway, with reduced levels of the metabolite GHB, indicating a potential mechanism similar to some anti-anxiety medications.
• Metabolomics revealed the extract influences lipid and bile acid metabolism, suggesting calming effects may involve whole-body metabolic regulation, not just the brain.
• The major compound rosmarinic acid also showed calming activity, though slightly less than the full extract, indicating it is a key but not sole active component.
• Calming supplements should be part of a broader management plan that includes behavioral training and environmental modifications for conditions like anxiety.
• Consult your veterinarian before starting any new supplement to ensure it is appropriate for your dog’s health profile and does not interact with existing treatments.

This article is for informational purposes only. Consult a qualified professional for personalised advice.

Sources:
https://pubmed.ncbi.nlm.nih.gov/40646521/
https://pubmed.ncbi.nlm.nih.gov/33996972/