Most OCD interventions focus on serotonin availability — how much serotonin is present in the synapse. Myo-Inositol works differently. It acts as a precursor in the phosphatidylinositol second-messenger system, which regulates how sensitive serotonin receptors are to the signal they receive.

When receptor sensitivity is impaired, even adequate serotonin levels fail to translate into the calming, inhibitory effect the nervous system needs. This is why some people respond to SSRIs but reach a ceiling — and why inositol has been studied as both a standalone treatment and an add-on for treatment-resistant cases.

In the landmark Fux et al. (1996) double-blind crossover trial, 18g/day of inositol produced a significant reduction in Yale-Brown OCD Scale (Y-BOCS) scores compared to placebo. Repose Still provides 15,000mg per serving — within the clinically studied range.

OCD involves two overlapping neurological problems. The first is serotonin receptor sensitivity — addressed by Myo-Inositol. The second is hyperactivity in the cortico-striatal-thalamo-cortical (CSTC) circuit, driven largely by excessive glutamate signalling.

This circuit is what produces the compulsive loop: a thought fires, an alarm is triggered, the brain tries to neutralise it through a ritual or mental check, and the loop reinforces itself. NAC modulates glutamate transmission in this circuit by acting on the cystine-glutamate antiporter — reducing excessive glutamate activity without sedating the system.

Multiple randomised controlled trials have investigated NAC specifically for OCD, showing significant reductions in Y-BOCS scores as an adjunct to standard treatment. It is also one of the most studied compounds for compulsive behaviour patterns broadly.

Magnesium plays a direct role in regulating the NMDA receptor — a glutamate receptor involved in neuronal excitability. Low magnesium reduces the natural brake on glutamate activity, which means the cortico-striatal circuit implicated in OCD becomes more active and harder to quiet.

Chronic psychological stress — which is both a trigger and a consequence of OCD — accelerates magnesium depletion through the stress-cortisol axis. Many people with OCD are running at a deficit without knowing it, directly worsening the neurochemical conditions that sustain intrusive thoughts and compulsive loops.

Magnesium glycinate is included because the glycinate chelate crosses the blood-brain barrier more effectively than oxide or citrate forms, providing targeted nervous system support rather than just general absorption.

Zinc is one of the most abundant trace metals in the brain, functioning as a neuromodulator across multiple signalling pathways. It inhibits NMDA receptors (reducing glutamate excitotoxicity), supports serotonin synthesis, and modulates GABAergic transmission — making it uniquely relevant to OCD neurochemistry.

Studies measuring serum zinc in OCD populations have consistently found significantly lower levels compared to healthy controls, and lower zinc directly correlates with higher symptom severity on standardised OCD scales. This reflects zinc's functional role in the exact circuits that OCD disrupts.

Zinc gluconate is used here for its superior absorption compared to zinc oxide. At 15mg, this is a therapeutic dose that restores adequate levels in those who are depleted without exceeding safe upper limits.

Serotonin is synthesised through a multi-step enzymatic process. Vitamin B6, as pyridoxal-5-phosphate (its active form), is a required cofactor at the critical conversion step: turning 5-hydroxytryptophan into serotonin via the enzyme aromatic L-amino acid decarboxylase. If B6 is deficient, this conversion is impaired regardless of how much precursor is available.

This is particularly relevant to OCD because the serotonin pathway is already compromised at the receptor level. Removing a cofactor that synthesis depends on compounds the problem further downstream.

B6 also plays a role in GABA synthesis. GABA is the brain's primary inhibitory neurotransmitter. Low B6 reduces GABA production, increases neurological excitability, and makes intrusive thought suppression neurologically harder. At 25mg, this dose supports both pathways well above deficiency thresholds.

Methylcobalamin is the biologically active form of B12 — unlike cyanocobalamin, it does not require conversion in the body before the nervous system can use it directly. B12 is a critical substrate in the methylation cycle, which governs the synthesis, use, and breakdown of serotonin, dopamine, and norepinephrine.

Disruptions in methylation — caused by B12 deficiency, MTHFR gene variants, or chronic stress — result in abnormal neurotransmitter regulation. In OCD, impaired methylation may worsen the serotonin receptor sensitivity problem that Myo-Inositol targets, compounding the neurological conditions that sustain intrusive thought loops.

B12 also maintains myelin — the protective sheath around nerve fibres governing the speed and reliability of neural signalling. Degraded myelin increases signal noise in neural circuits, contributing to the "sticky" quality of OCD intrusive thoughts. At 500mcg, this dose supports optimal methylation without exceeding safe thresholds.