This formula's own materials name magnesium stearate directly as an inactive lubricant ingredient commonly used in capsule manufacturing.
Magnesium stearate is disclosed as one of the two inactive ingredients in this formula, alongside rice flour, serving a manufacturing function rather than a cognitive one.
This formula's own materials list this ingredient specifically rather than folding it into an unnamed "other ingredients" line — worth reading that specificity as part of the formula's broader eight-named-ingredients transparency claim.