Several specifications correspond to these denominations. Here's an overview of the different organic, biodynamic and natural specifications:Organic specifications (AB label) prohibit all use of synthetic chemicals in the vineyard and cellar. It does, however, allow for a few oenological crutches during vinification. Sulfites, for example, are tolerated up to 100 mg/L for red wines and 150 mg/L for whites. In biodynamic viticulture (Demeter or Biodyvin label), the winemaker not only works without synthetic chemicals, but also takes into account the lunar calendar for all the operations he carries out. He also uses biodynamic preparations (fermented horn dung, silica, plant teas, etc.) to strengthen the vines. Overall, the winegrower seeks to integrate vine cultivation into a global environment. Sulphites can be as low as 70 mg/L for reds and 90 mg/L for whites. In Vin Méthode Nature, the specifications specify the use of organic grapes, fermented naturally with indigenous yeasts (as in biodynamic viticulture). Natural wines receive no inputs during vinification or ageing. Only minimal doses of SO2 are permitted (30 mg/L maximum), and must be specified by the winemaker. No brutal filtration or alteration techniques are permitted. We also find the Vins SAINS designation, which aims to ban the use of sulfites altogether.