San Gimignano Vin Santo (Vinsanto) DOC is a sweet white wine made from the same geographic area and under the same rules authorised for Vernaccia di San Gimignano DOCG but from 30% minimum Trebbiano Toscano, up to 50% Malvasia Bianca, up to 20% Vernaccia di San Gimignano, and upto 10% any white grape authorised in Tuscany. Grape yields are set at 10 tonnes per hectare (4 tons per acre).
Winemaking: The grapes must be pressed between 1st December and 31st March following the harvest. The juice must ferment and age in wooden casks no bigger than 250-litres. The wine can be sold from 1st November in the third year after harvest, or in the fourth year for Riserva. The wine must have a minimum potential alcohol of 16.5%, and a minimum actual alcohol level of 14.5%. The maximum level of volatile acidity is 1.6g/l. The minimum level of dry extract is 21g/l.