The advantages of the glycerin molecule, which is smaller than that of gluconate, are: it improves bioavailability because it can more easily cross the cell membrane; it slows down absorption so that the effect lasts longer; it masks the metallic taste of trace elements; and it stabilizes trace elements, allowing them to be mixed in equal parts and creating personalized formulas. Instructions for use The recommended use for Ifigen Iron (Fe) Trace Elements 150 ml is to take 10 drops daily, preferably diluted in water or juice, for 3 to 4 weeks. It is recommended to take before main meals. It is important to follow the manufacturers instructions and consult a healthcare professional before starting any supplement. ingredients Iron (225 mg), Purified water (90%), Glycerol (10%), Sorbic acid (1 g).