My own research tells me two apples could give you 2000 mg which is a guidelines for working out the dose for the Liver Flush but it is always worth trying to extract the maximum from a supplement. Liver-flushers have typically taken 1000 mg to 5000 mg per day for 1 to 2 weeks of magnesium malate.
The use of malic acid (Malate) isn't well documented and isn't validated by medical evidence. The claim is made that it helps to separate the cholesterol molecules during the digestive phase which indicates that it is only valuable when taken with food. Medical evidence would further indicate that you need to eat some high fibre at the same time as this binds to the cholesterol which is then passed out of the body normally, in stools. The process helps to establish an efficient cholesterol cycle and encourages the liver to produce fresh cholesterol which will de-saturate bile and in theory softened stones.
The average dose of malic acid on its own is 3g but should be taken in with food that contains some fat and fibre.
Side Effects of magnesium malate
People with kidney problems are unable to secrete magnesium and should consult a doctor before supplementing with magnesium. Large amounts of magnesium, or sudden increases in dosage, can cause abdominal cramping, diarrhoea and nausea. Diarrhoea usually prevents toxicity from overdosing on magnesium.
Consuming certain foods and supplements decreases the body's ability to absorb magnesium, according to Phyllis Balch, in her book "Prescription for Nutritional Healing." Vitamin D, calcium, cod liver oil, tea, cocoa and high amounts of fat reduce magnesium absorption. Greens such as spinach and chard are high in oxalic acid, which also interferes with magnesium assimilation.