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BMC Chemistry's 2013 work on Romanian Transylvania biotypes reported 112.20–360.22 mg/100g vitamin C in frozen pulp — a roughly 3× spread within a single regional production base. Nature Scientific Reports' 2023 HPLC analysis of Iranian ecotypes extended the upper bound to 419.70 mg/100g on a dry-weight basis. The actionable takeaway: a 'rosehip powder' lot will land somewhere inside a 4× variance band unless the spec contracts against an explicit HPLC vitamin C floor, with test method, drying method, and DW-vs-FW basis written in. Marketing claims of '20× orange' are per-100-g fresh-weight defensible but mislead the per-serving comparison.

Hot-air drying loses 50%+ of starting vitamin C (Journal of Food Engineering 2005). Optimal hot-air condition is 60 °C with 1.5 m/s air-flow. Freeze-drying retains roughly 90–95%. Microwave-vacuum drying lands at 75–90%. A specification that says 'vitamin C ≥ X mg/100g' without naming the drying method is a half-spec — the same starting batch can land at very different finished numbers depending on the dryer.

Linoleic acid (Omega-6) 48–54%, alpha-linolenic acid (Omega-3) 16–19%, oleic acid 14–19%, palmitic 2–3%, stearic 1.5–2.5% — Taylor & Francis 2013 and ScienceDirect Serbia 2022. Total PUFA ≈ 70%. Geographic variance is real (Serbia regional lots ranged linoleic 24.5–46.7%) — the spec needs to anchor against the lot, not the regional average. Fresh cold-pressed peroxide value benchmark sits at 1.2–2.1 meq O₂/kg as the cosmetic-grade dispatch floor. Trans-retinoic acid (vitamin A active) is present at 0.051–0.375 mg/L after cold press — orders of magnitude below prescription tretinoin, so 'natural retinol equivalent' marketing overstates the chemistry. Rosehip seed oil does NOT contain vitamin C (ascorbic acid is water-soluble).

EMA HMPC inventory lists Rosa canina as 'not processed' — there is no EU-central monograph specific to rosehip. The European Pharmacopoeia covers rosehip under Rosae pseudo-fructus with TLC ascorbic acid identification; that is the pharmacopoeial raw-material identity standard. EFSA Article 13 health claim ID 2334 ('invigoration of the body') sits on the on-hold botanical claims register since 2010 — legally usable under Reg 1924/2006 Art 28(5) transitional measures but unstable, the Commission can reject any time. The vitamin C nutrient claim is a separate route: a food delivering ≥15% NRV per 100g can use the EFSA-approved vitamin C health claims (immune function, collagen formation, DNA protection — EFSA Journal 2009). The Litozin / GALFLEX osteoarthritis RCT evidence is medium (Winther 2005 n=112, OARSI meta-analysis 2008 n=287, industry-sponsored); no EMA-authorised osteoarthritis claim exists.

Romanian Transylvania + Arad — peer-reviewed by BMC Chemistry 2013 — is the auditable provenance anchor for the powder + dried-shells line, with the biotype range documented at primary-source level. Turkey (Gümüşhane, Erzincan, Tokat) and Bulgaria Rhodope wildcraft handle the higher-volume wild-harvest base; CBI Netherlands reports EU wholesale rosehip seed oil at €40–70/kg, FOB ~€25/kg, Germany the largest cosmetic destination. Industrial-volume cosmetic-grade cold-pressed seed oil is dominated by Chilean Rosa rubiginosa supply — a specification that depends on Rosa canina specifically should write the Latin binomial into the contract to avoid Rosa rubiginosa material shipping under the same 'rosehip' name.

EU Regulation 396/2005 sets pesticide MRLs (default 0.01 mg/kg if no rosehip-specific entry exists). EU Regulation 2023/915 (effective 25 May 2023, replaced Reg 1881/2006) sets heavy-metal maximum levels for Pb, Cd, Hg, As, Ni — category-specific. Organic-certified lots are typically screened against a multi-residue pesticide panel (GC-MS + LC-MS) plus the heavy-metal panel, with results reported per shipment. Microbiological criteria for processed forms are governed by Reg 2073/2005. The per-shipment COA panel anchors against these four regulatory references.