Organic Wine comes from vineyards that are farmed using organic practices, meaning no pesticides, no herbicides, and no chemical fertilizers. In the US organic wines cannot contain any added sulphites. In the EU some sulphites are permitted less then 100 parts per million (ppm) per litre for reds, and 150ppms for Dry whites and ros?s.
Biodynamic Wine is produced using biodynamic farming principals, a spiritual-ethical-ecological approach to agriculture, gardens, food production and nutrition?, brought about by Austrian philosopher Rudolf Steiner in the 1920s. The vineyard is viewed as one ecosystem, with each part contributing to the next. Chemical fertilizers and pesticides are forbidden for the sake of soil fertility. In terms of sulphites Demeter has stricter regulations allowing less then 70ppm for reds, and 90ppm for dry white and rose wines.
The practice of making NATURAL WINE is in essence the most genuine and natural wine produced, with NO additions ie sulphites, yeasts etc or subtractions in the process. However, it is the only one of the three that is not currently regulated. In theory, natural wines are more alive, less manipulpulated; in practice, die-hard adherence to the philosophy sometimes wins out over actual appeal: Some natural wines are delicious, and some are just flat-out weird. Ray Isle Food & Wine 2019 Sulfur dioxide – SO2(Sulphites) are added to wine as a preservative but it is also a natural by-product of fermentation so there will almost always be trace amounts of naturally occurring sulpfites in wine, even those with no additives.