Mechanism of Action
Magnesium's primary calming mechanism is voltage-dependent blockade of NMDA (N-methyl-D-aspartate) receptors, which are the principal excitatory glutamate receptors in the central nervous system. In a resting state, magnesium ions physically occupy the NMDA receptor channel, preventing the excessive excitatory signalling associated with anxiety and hypervigilance. When cellular magnesium is depleted, this protective block is removed and neural excitability increases. Magnesium also supports GABA receptor sensitivity (the primary inhibitory neurotransmitter) and modulates the HPA axis by reducing corticotropin-releasing hormone release, lowering cortisol under chronic stress. In muscle tissue, it regulates calcium-dependent contraction, supporting the muscle relaxation component of physical stress responses.
Evidence Summary
The relationship between magnesium status and anxiety is well established in human medicine. A 2017 systematic review by Boyle et al (Nutrients) reviewed 18 studies and found consistent evidence that magnesium supplementation reduced subjective anxiety in human subjects with low to suboptimal magnesium status. The NMDA antagonism mechanism is shared across mammalian species and provides a strong physiological basis for extrapolation to dogs. Veterinary-specific clinical trials on magnesium supplementation for anxiety are limited. Petz Park positions magnesium as a physiological calming support component, working through a different mechanism to the other ingredients in the formula.
In Petz Park Products
Stress and Anxiety for Dogs: Magnesium 100mg per scoop. Multivitamin for Dogs: Magnesium 63mg per scoop. Note: Magnesium is also present in the Stress and Anxiety for Cats formula. The cat formula is currently being updated and the confirmed dose will be added here once finalised.
Safety and Considerations
Magnesium is safe for dogs and cats at supplemental doses. At very high doses it can cause loose stools through an osmotic effect. The doses in Petz Park formulas are well within normal supplemental ranges. Consult a veterinarian before supplementing in animals with diagnosed kidney disease, as impaired kidneys have reduced capacity to excrete excess magnesium.