Want to know how to make a serum? Mandelic Concentration 30% Mandelic 30% AnyGel™ 1% Isopentyldiol 2% Ethyl Alcohol 20% Polysorbate 20 (Tween 20) 5% Panthenol (Pro Vitamin B5) 3% Safe-B3 ™ ( Vitamin B3, Niacinamide ) 5% Mild Preserved Eco™ (Ethylhexylglycerin) 0.5% น้ำกลั่น sterile 33.5%