

within 3 weeks
A comparative study of skin lightening efficacy based on the IC50 values:
Compound | IC50 μm | Mode of activity/ | Visibility | Stability | Optimal | Source |
Tyrosinase Inhibition | Significant whitening | In formulation | Quantity In formulation | |||
Resveratrol | 54.6 μm | Reversible | 6- 8 weeks | Stable | 2.0 .% | Morus Alba |
Kojic acid | 40 μm | Reversible | 6-8 weeks | Stable | 3 .0% | Koji , Shitake Reishe |
Oxyresveratrol | 1.7 μm | Reversible | 2-3 weeks | Stable | 0.2 -0.3 % | Artocarpus Lakoocha |
Dihydrooxyresveratrol | 0.3 μm | Reversible | Less than 2/3 weeks | Stable | 0.1 - 0.2 % | Morus Alba, Artocarpus Lakoocha |
Table 1 summarizes the IC50 values of natural products used in skin brightening/skin whitening formulations..Lower the IC50, better is the activity
Table 1. Tyrosinase inhibition in 300 _M and 60 _M, and IC50 values of compounds isolated from Morus alba wood.
Compound | Tyrosinase Inhibition | ||
% +STD (300 _M) | % +STD (60 _M) | IC50 +STD (_M) * | |
1. Di hydro oxyresveratrol | 98.2 +0.5 | 97.6 +0.2 | 0.3 +0.05 |
2. Oxyresveratrol | 97.8 +0.1 | 93.1 +0.1 | 1.7 +0.04 |
3. Kojic acid | 96.0 +0.2 | 94.2 +0.2 | 16.1 +1.4 |
4. Moracin M | 87.2 +0.5 | 61.3 +1.2 | 8.0+ 0.6 |