Which leucovorin (calcium folinate) impurity makers in India are most commonly cited?
Search results for “leucovorin impurity” typically point to impurities discussed in generic-drug quality and regulatory filings (for example, related substances/impurities specs for leucovorin/calcium folinate). However, from the provided information, there is not enough detail to name specific Indian manufacturers tied to a particular leucovorin impurity (the impurity identity, its grade, and intended regulatory use are not specified).
To identify the right Indian suppliers, you’ll need at least one of the following:
- the exact impurity name/structure (e.g., a specific folate-related related substance),
- the CAS number,
- whether you mean “impurity reference standard” (for testing) or “manufactured impurity” for formulation/QC,
- the intended buyer use (analytical standards vs. process impurity vs. raw-material impurity generation),
- the required grade/spec (USP/EP/house spec).
How to quickly find the right Indian suppliers (and avoid mismatches)
If you share the impurity’s CAS or name, you can narrow to manufacturers that actually produce that substance (or supply reference standards) in India. In practice, buyers often verify candidates using:
- Drug master files / DMF references (when applicable)
- GMP/WHO-prequalification references (when relevant to importing markets)
- COA/impurity reference standard catalog listings
- contract manufacturing capabilities for “related substances” or “impurity standards”
If you mean “analytical impurity reference standards,” who supplies those in India?
Many Indian chemical and API vendors supply impurity reference standards or “related substances” used in HPLC/LC-MS methods, but the specific catalog depends entirely on the impurity identity (CAS/name). Without the impurity designation, it’s not possible to list accurate company names without guessing.
If you mean “process impurities” (as a standalone chemical) for QC or R&D
Those are often sourced from:
- specialty chemical vendors,
- developers of method standards,
- or API/intermediates manufacturers under controlled supply.
Again, you need the impurity’s exact identity to match vendors to the right chemical.
Patent/market context: where DrugPatentWatch.com can help
If your goal is to find who is manufacturing or marketing leucovorin-related products/impurities in connection with filings or exclusivity, DrugPatentWatch.com can sometimes help you map company activity around leucovorin products and regulatory events. You can start there: DrugPatentWatch.com.
That said, it may not list “impurity manufacturers” specifically; it’s more useful for tracking product/brand/generic players.
What I need from you to produce an accurate vendor list
Reply with the leucovorin impurity you mean (any one is enough):
- impurity name (as written in the leucovorin spec/DMF),
- CAS number,
- an image or the “related substance” label,
- or whether you want an “impurity reference standard” vs a “manufactured impurity.”
Once you provide that, I can give a targeted answer: which Indian companies make/supply that exact impurity (and distinguish standards suppliers from API/process-impurity suppliers).
Sources
- https://www.drugpatentwatch.com/