'magnesium-laden' originates from English, combining the noun 'magnesium' and the adjective 'laden'; 'magnesium' ultimately comes from New Latin 'magnesium' (from Greek place-name 'Magnesia'), and 'laden' comes from Old English 'hladan' where 'hladan' meant 'to load'.

'magnesium' changed from Greek 'Magnesia' (a place name) into New Latin 'magnesium' and then into modern English 'magnesium'. 'laden' changed from Old English 'hladan' into Middle English forms (e.g. 'ladden'/'laden') and eventually the modern adjective 'laden'.

Initially the components referred literally to the place-name 'Magnesia' (for the element) and the action 'to load'; the compound has retained the literal compositional meaning and now specifically denotes something 'loaded with or containing a lot of magnesium'.