Gingbings

The gingbings' surprising property is to make someone physically younger upon consumption. In current knowledge, 10 grams seems to reduce 1 year of age. Extremely rare and extremely difficult to cultivate, wild gingbings are the only ones with de-aging effects. Because of that, the market is flooded with fake gingbings that vastly outnumber the real ones. An experienced alchemist can evaluate legitimacy.