I've been using this formula for many years and it's OK, so I want it to be close to this recipe. (Someone provides serum formula) Pure Aloe Vera Gel (non-cosmetic) - whitening : Tranexamic Acid ( ทราเนซามิค แอซิด ): Tranexamic Acid 3% whitening : MSH White Absorb (TM): MSH White Absorb (TM) 5% whit...