Bioavailable Magnesium Supplement. Size: 420 g oral powder (30 days) In healthy people, ingredients in Fibroplex Plus have been shown to or may assist in: Support for muscular aches, spasms and cramping. Provide magnesium supplementation to support production of cellular energy. Bioavailable Meta Mag® in three great flavours. Warning: Stop taking this medication if you experience tingling, burning or numbness and see your healthcare practitioner as soon as possible. [Contains vitamin B6]. This product contains selenium which is toxic in high doses. A daily dose of 150 micrograms for adults of selenium from dietary supplements should not be exceeded. Vitamin supplements should not replace a balanced diet. Adults: Add 1 scoop (7 g) to 200 mL of water or juice twice daily.