I do not think magnesium tablets can be used as an electrode in a lemon battery. Magnesium tablets, like other other supplements, contain magnesium in the form of magnesium salts, magnesium acid complexes and other substances (a lot of which are non-metals) compounded to magnesium that would interfere with the oxidation reaction that is harnessed.
Nails, coins and other largely metallic substances have been used as electrodes for the device instead. Different metals such as iron, copper, zinc, lead, and even amalgamated zinc treated with mercury have been used as variations.
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