Concept
MCR (Rectified Concentrated Must)
Concentrated, rectified grape must stripped to pure sugar, often used in Champagne dosage as an alternative to cane sugar.
What MCR is
MCR stands for moût concentré rectifié, in English rectified concentrated grape must. It is grape juice stripped of colour, flavour, acids and minerals through filtration and ion exchange. What remains is a thick, colourless syrup at around sixty-five percent sugar, biochemically near-identical to sucrose.
In Champagne, MCR works as an alternative to cane sugar when producers build the liqueur de dosage. The Comité Champagne permits both options under the regional regulations. Outside Champagne, MCR also gets used to lift alcohol levels in still wines from cool vintages, a practice sometimes called enrichment.
Why producers reach for it
For some producers MCR is the logical choice. It comes from the same grapes they already work with, without an external sugar source, which fits the narrative of everything from our own harvest. For others the appeal is purely practical. MCR mixes more readily with wine, never crystallises out of solution, and gives a more consistent result than dissolving cane sugar by hand.
The flavour difference is minimal. Blind tastings rarely show a reliable split between Brut Champagne dosed with MCR and Brut dosed with cane sugar, provided both are corrected to the same grams per litre. Wine-Searcher reported on these comparison panels in 2019.
Where the marketing oversells
Sellers sometimes frame MCR-dosage as more pure or more natural than cane sugar. That framing misleads. MCR is industrially concentrated through reverse osmosis and chemical rectification. From a processing standpoint it is more heavily worked than a block of organic cane sugar.
What MCR delivers is regional consistency and a closed-loop narrative within Champagne, not craft authenticity. Anyone who believes an MCR-dosed Brut is somehow purer than a cane-sugar Brut is buying a story the chemistry does not support.
In practice
For the consumer, the relevant variable is total grams of sugar per litre, not whether the sugar came from MCR or sucrose. If you want less sweetness, read the label term: Brut Nature, Extra Brut or Brut.
Some producers volunteer their choice in marketing material, others stay silent. Ask at a tasting. The answer tells you something about the house philosophy, not about what is in the glass.
Frequently asked questions
What’s the difference between MCR and cane sugar?
In taste, virtually nothing. Both deliver pure sucrose in solution. The difference lies in origin (MCR from grapes, cane sugar from sugar cane or beet) and in process (MCR via filtration and rectification, cane sugar via refining). For the eventual flavour profile of Champagne it is negligible.
Is MCR dosage more natural?
No. MCR is industrially processed grape juice from which all natural components (colour, flavour, acids) have been removed. It is technically more processed than unrefined cane sugar. The “MCR is more natural” claim sits in marketing material, not in the chemistry.
Which houses use MCR?
Many large houses and a growing share of grower Champagne use MCR because it can come from their own harvest and produces consistent results. Specific producers rarely volunteer it on the label. Selosse, Vouette et Sorbée and some natural-wine-leaning growers deliberately avoid MCR and use old oxidative reserve wines as dosage instead.