Italian apple cider vinegar: double fermentation and traceability

From history to alchemy: the art of fermentation

The use offruit vinegar is already documented in Mesopotamian and Persian civilizations, where fermented beverages served as preservatives and tonics. Inancient Rome the  posca — a mixture of vinegar and water consumed by legionaries for its refreshing and antimicrobial properties — cited by sources such as Pliny the Elder and documented in military and agricultural contexts. In  the Middle Ages apple cider vinegar was part of  folk pharmacopeia as a remedy for digestive disorders and infections, passed down through monastic recipes and herbal treatises.

Acetic fermentation was already known to the Arab alchemist  Jabir ibn Hayyan (8th century), who described the production of acetic acid by distillation, paving the way for the chemical understanding of a process that remained empirical for centuries. Only in the 19th century  Louis Pasteur identified acetobacteria as agents responsible for the transformation of ethanol into acetic acid, laying the foundations of microbiology applied to the food industry.

Apple growing and terroir: the quality of the raw material

Apple cider vinegar comes from the fruits of  Malus domestica Borkh. (Rosaceae), a species native to Central Asia — in the region that corresponds to present-day Kazakhstan — spread in Europe through the trade routes of the Silk Road. The quality of the final product largely depends on the  polyphenolic composition of the raw material: chlorogenic acid, catechin, caffeic acid, and ferulic acid are the main bioactive compounds transferred, at least in part, to the finished product (Budak et al., 2014).

In  Italy apiculture is concentrated in the alpine and foothill regions. Assomela data updated to 2025 indicate a  national production of about 2.32 million tons, with Trentino-Alto Adige alone covering about 64% of the total: the province of Bolzano reached over 1.05 million tons (+2% compared to 2024) and that of Trento over 517,000 tons (+8%) (Assomela/Radio NBC, 2025). In the 2024/25 season, according to ISMEA monitoring published in February 2026, Italy became the  world's leading apple exporter by value, with a trade balance of 1.146 billion euros and a share of about 16% of global trade — surpassing historic competitors such as China and the United States (ISMEA, 2026).

Areas suitable for processing apple production benefit from optimal pedoclimatic conditions: marked temperature variations between day and night, well-drained and mineral-rich soils, alpine-quality water availability. These conditions promote the accumulation of fermentable sugars and organic acids in the fruits, essential for the development of subsequent fermentations.

Double fermentation techniques: from cider to vinegar

The production of apple cider vinegar includes two distinct and sequential biological phases (Dongo, 2025):

• in the  alcoholic fermentation, yeasts of the genus  Saccharomyces — naturally present on the peel or selected in culture — transform the sugars in the apple juice into ethanol and carbon dioxide, producing cider. The quality of the cider — alcohol content, aromatic profile, acidity — directly influences the quality of the final vinegar;

• in the  acetic fermentation, bacteria of the genus  Acetobacter e Gluconobacter oxidize ethanol into acetic acid in the presence of oxygen. This phase can be conducted with two main approaches. The traditional method slow fermentation, often in oak or chestnut wooden barrels, allows for gradual development of secondary aromas and promotes the formation of the so-called 'mother of vinegar' — a biofilm of acetic bacteria and bacterial cellulose that many artisanal producers keep as a starter culture of continuity. The submerged fermentation method (submerged fermentation) used on an industrial scale, ensures reduced production times and greater product standardization.

The vinegars  unfiltered and unpasteurized retain the 'mother' and a more complex aromatic profile, characterized by fruity notes and a slight turbidity appreciated in premium and organic markets. Pasteurization, on the other hand, inactivates acetic bacteria but stabilizes the product for long-range distribution.

Biochemical profile and phenolic compounds

From an energy standpoint, apple cider vinegar is a food with very low caloric content. According to data provided by Humanitas Research Hospital, 100 g of apple cider vinegar provides on average:

• energy: 21 kcal;

• carbohydrates: 0.9 g;

• sugars: 0.4 g.

In addition to theacetic acid — main component with a typical concentration around 5% — apple cider vinegar contains a range of  phenolic compounds derived from the original fruit: chlorogenic acid, catechin, caffeic acid, ferulic acid, and gallic acid. These compounds contribute to the antioxidant properties and the aromatic profile of the product and are of interest for their potential biological effects (Budak et al., 2014).

Scientific evidence on metabolism and potential benefits

In recent years, scientific research has deepened the potential effects of apple cider vinegar on  metabolism:

• a  systematic review and meta-analysis published in  Frontiers in Nutrition in 2025 (Arjmandfard et al., 2025), based on seven controlled clinical trials with 463 participants with type 2 diabetes, showed that the consumption of apple cider vinegar significantly reduces fasting blood glucose  fasting blood glucose (WMD: −21.9 mg/dL) and HbA1c (WMD: −1.53%), while increasing insulin levels. The hypothesized mechanisms include inhibition of α-amylase and intestinal disaccharidases by acetic acid, delay of gastric emptying, and reduction of hepatic glucose production;

• The meta-analysis by Hadi et al. (2021) had already documented a favorable effect of apple cider vinegar consumption on fasting blood glucose and the lipid profile in subjects with metabolic disorders;

• a broader review of 25 clinical trials (1,320 adults), published in Current Medicinal Chemistry (Tehrani et al., 2025), confirmed reductions significant reductions in fasting blood glucose, glycated hemoglobin (HbA1c), and total cholesterol.

The hypothesis that apple cider vinegar exerts  antimicrobial effects — already empirically known in antiquity and supported by in vitro studies — is reflected in the properties of acetic acid in counteracting  Escherichia coli, Staphylococcus aureus e Candida albicans (Budak et al., 2014).

It is however essential to remember that none of these effects has so far been authorized as a health claim in the European Union under Regulation (EC) No 1924/2006, and that most available studies show limitations in sample size, dosage heterogeneity, and short follow-up duration.

The global apple cider vinegar market: trends and outlook

The  global market of apple cider vinegar surpassed the one billion dollar threshold ahead of original projections. According to Data Bridge Market Research (2025), the sector's value stood at about  1.16 billion USD in 2024, with a compound annual growth rate (CAGR) expected of8,6% until 2032 — the year in which it is expected to reach 2.24 billion. Convergent estimates from IMARC Group (2025) place the 2024 value at 1.13 billion USD with a CAGR of 7% until 2033.

The segment  organic and unfiltered confirms itself as the most dynamic, with the organic product representing over in 2025  32% of global revenues and was growing at a rate above the industry average (Mordor Intelligence, 2026). The  North America holds the highest market share (about 33% in 2025), but it is theAsia-Pacific registering the highest CAGR, projected beyond 10% until 2031, driven by China and India.

For Italian producers, the  premium positioning of apple cider vinegar organic unfiltered — enhanced by the international reputation of ‘Made in Italy’ food and the quality of apple raw materials — represents a concrete competitive lever in European and North American markets, where consumers seek functional, traceable, and minimally processed dressings.

Organic and sustainability in the apple supply chain

The transition to sustainable agricultural practices increasingly affects the Italian apple supply chain. In 2024 the  organic production of apples has resumed growth after the 2023 decline, returning to a positive trajectory (Assomela, 2025). The organic apple cider vinegar supply chain benefits from a solid regulatory framework: Regulation (EU) 2018/848 on organic production guarantees full ‘from farm to fork’ traceability and the certainty of standards subject to strict controls (Dongo, 2024).

The companies of Trentino-Alto Adige are also developing advanced integrated pest management systems that include pesticide reduction, soil management with cover crops, and the enhancement of  varietal biodiversity, including historic local cultivars now also used for cider and artisanal vinegar production.

Versatility in the kitchen: pairings and culinary uses

Apple cider vinegar is a condiment of extraordinary versatility. Its aromatic profile — more delicate and fruity compared towine vinegar — making it particularly suitable for salads of raw and mixed vegetables,  marinades of fish and white meats, light vinaigrettes, preservation of pickled vegetables, preparation of chutneys and sweet and sour sauces inspired by Anglo-Saxon and Northern European cuisine. It is also a reference ingredient in so-called 'drinking vinegars' and shrubs, flavored fermented beverages experiencing strong growth in the wellness segment.

In combination with  Italian monofloral honeys, alpine aromatic herbs or  traditional balsamic vinegar in gourmet blends, Italian apple cider vinegar can express remarkably complex sensory profiles, enhancing the varietal characteristics of the raw material.

Buyer’s guide: how to choose quality apple cider vinegar

To select quality Italian apple cider vinegar, professional buyers and importers should verify the following elements:

• organic certification pursuant to Reg. (EU) 2018/848;

• production method: traditional slow fermentation or submerged fermentation, indicated on the label;

• presence or absence of 'mother of vinegar', an index of unfiltered and unpasteurized product;

• origin of apples: preferably Italian, with indication of region or denomination where applicable (e.g. Alto Adige PGI apple, Trentino PGI apple);

• absence of added flavors, colorants, or sulfites.

The team of  GIFT (Great Italian Food Trade) supports importers and distributors in the selection of qualified Italian producers, with specific expertise in organic, sustainable, and transparent supply chains.

Conclusions

Italian apple cider vinegar represents a strategic asset for the enhancement of the national fruit supply chain. The combination of excellent raw materials subjected to controlled processing ensures a product that meets the highest traceability standards required by international markets. For industry operators, focusing on certified quality and transparent production methods constitutes an essential competitive advantage in the current economic landscape.

Dario Dongo

Photo by Towfiqu barbhuiya on Unsplash

References

Arjmandfard, A., Behzadi, B., Sohrabi, Z., & Mohammadi Sartang, M. (2025). Effects of apple cider vinegar on glycemic control and insulin sensitivity in patients with type 2 diabetes: A GRADE-assessed systematic review and dose-response meta-analysis of controlled clinical trials.  Frontiers in Nutrition, 12, 1528383. https://doi.org/10.3389/fnut.2025.1528383

Assomela. (2025, December).  Italian apple production data 2025. Radio NBC Rete Regione. https://radionbc.it/production-of-apples-growing-in-2025-in-trentino-and-alto-adige/

Budak, N. H., Aykin, E., Seydim, A. C., Greene, A. K., & Guzel-Seydim, Z. B. (2014). Functional properties of vinegar.  Journal of Food Science, 79(5), R757–R764. https://doi.org/10.1111/1750-3841.12434

Data Bridge Market Research. (2025).  Global apple cider vinegar market – size, share, and trends analysis report, 2025–2032. https://www.databridgemarketresearch.com/reports/global-apple-cider-vinegar-market

Dongo, D. (2024, August 14). Organic, Handbook on official investigations.  Food Times. https://www.foodtimes.eu/en/food-systems/organic-handbook-on-official-investigations/

Hadi, A., Pourmasoumi, M., Najafgholizadeh, A., Clark, C. C. T., & Esmaillzadeh, A. (2021). The effect of apple cider vinegar on lipid profiles and glycemic parameters: a systematic review and meta-analysis of randomized clinical trials.  BMC Complementary Medicine and Therapies, 21, 179. https://doi.org/10.1186/s12906-021-03351-w

Humanitas Research Hospital. (n.d.).  apple cider vinegar. https://www.humanitas.it/enciclopedia/alimenti/condimenti/aceto-di-mele/

IMARC Group. (2025).  Apple cider vinegar market: global industry trends, share, size, growth, opportunity and forecast 2025–2033. https://www.imarcgroup.com/apple-cider-vinegar-market

ISMEA. (2026, February 4).  The Italian apple between tradition and new varieties: positive 2025 numbers from ISMEA monitoring. https://www.ismeamercati.it/flex/cm/pages/ServeBLOB.php/L/IT/IDPagina/13767

Johnston, C. S., Kim, C. M., & Buller, A. J. (2004). Vinegar improves insulin sensitivity to a high-carbohydrate meal in subjects with insulin resistance or type 2 diabetes.  Diabetes Care, 27(1), 281–282. https://doi.org/10.2337/diacare.27.1.281

Kondo, T., Kishi, M., Fushimi, T., & Ugajin, S. (2009). Vinegar intake reduces body weight, body fat mass, and serum triglyceride levels in obese Japanese subjects.  Bioscience, Biotechnology, and Biochemistry, 73(8), 1837–1843. https://doi.org/10.1271/bbb.90231

Mordor Intelligence. (2026).  Apple cider vinegar market size & share analysis – growth trends & forecasts 2026–2031. https://www.mordorintelligence.com/industry-reports/apple-cider-vinegar-market

Regulation (EU) 2018/848 of the European Parliament and of the Council of 30 May 2018 on organic production and labelling of organic products. Consolidated text: 25/03/2025. http://data.europa.eu/eli/reg/2018/848/2025-03-25

Tehrani, S. D., Keshani, M., Rouhani, M. H., Moallem, S. A., Bagherniya, M., & Sahebkar, A. (2025). The effects of apple cider vinegar on cardiometabolic risk factors: a systematic review and meta-analysis of clinical trials.  Current Medicinal Chemistry, 32(11), 2257–2274. https://doi.org/10.2174/0929867331666230822102021