Sweet Vermouth
Sweet Vermouth is a vermouth at 16% ABV, used in 4 drinks on this site.

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Four bottles of vermouth standing in a row, three dark and one green, each with a different producer's label
Composition
Vermouth is wine-based, and wine may be clarified with isinglass, made from fish, or with gelatine. Neither is a declarable allergen and neither has to appear on a label, so whether a particular bottle is vegan is a question about that producer rather than about vermouth.
Producer published figures · camparigroup.info/usa/cinzano/1757-vermouth-di-torino-rosso — Vermouth is not a standardised product and FoodData Central carries nothing closer than dessert wine, which is a different drink at a different strength. The figures here are one producer's published declaration for a Vermouth di Torino rosso - 16% alc./vol., and per 1.5 fl oz serving 64 calories and 6.8 g of carbohydrate, restated per 100 ml - taken as the reference for the category rather than as a measurement of every bottle. Sweet vermouths run from about 15% to 18% and from roughly 130 to 180 g of sugar per litre, and a bottle at the other end of either range moves this drink's figures. The sulphite flag is the producer's own declaration.