Are there pills or supplements i can take for either leptin or magnesium?

Mag oxide: For magnesium supplements, there sure are pills to take at natural food stores. Also, any over the counter pharmacy carries magnesium oxide tablets. Long term magnesium intake is not advisable if you have kidney disease unless your blood levels of magnesium are low. High doses of magnesium also causes diarrhea. That's why we use milk of magnesia (magnesium hydroxide) for constipation bec it has magnesium.

Magnesium chelate: Average adult needs about 500 mg of elemental (see label) magnesium per day, gained from foods especially leafy greens. Many adults are deficient. Best form is magnesium, an elemental metal, chelated to an organic Amino Acid like orate, gluconate or asparatate. These chelates better absorbed than magnesium bound to oxide, which is inorganic (epsom salts) and which causes loose stools.