The vitamin C molecule (ascorbic acid) is chemically identical regardless of whether it originates from synthesis or a plant source such as rosehip. The difference is that natural extracts, such as rosehip and acerola, bring along accompanying plant compounds (bioflavonoids), which some data suggest may improve cellular (leukocyte) uptake of vitamin C, though not necessarily plasma concentrations (Calder et al., 2025). This means the natural form may offer a slight added value, but is not necessarily substantially 'better' than pure ascorbic acid at the same dose.

For most people, a daily dose of 1000 mg vitamin C is safe, as the upper safe limit (UL) according to EFSA is 2000 mg/day. Still, a precautionary note applies: in a prospective cohort study, additional (supplemental) vitamin C use ≥1000 mg/day in men was associated with roughly double the relative risk of developing kidney (oxalate) stones compared to those without such supplementation, while this association was not confirmed in women (Ferraro et al., 2016). If you have a history of kidney stones or another kidney condition, it's best to consult a doctor before regularly taking this dose.

These ingredients are not part of the vitamin C itself, but technical components of the capsule and formula: maltodextrin is a carrier for the powdered extracts, carrageenan and modified starch are part of the capsule shell itself (HPMC), while silicon dioxide and magnesium salts of fatty acids prevent powder clumping during production. Without these auxiliary substances, it would be technically more difficult to produce a stable, evenly dosed capsule from a dense plant extract. The proportion of these ingredients is small, and the active ingredient (vitamin C from rosehip and acerola) is precisely quantified, which represents above-average transparency within this category.

Vitamin C does not prevent colds and is not a substitute for medical care, but a modest effect has been shown with regular daily use: a Cochrane meta-analysis (Hemilä & Chalker, 2013) found that in adults who regularly took vitamin C (not just at the onset of symptoms) at doses of 1 to 8 g/day, cold duration was shortened by about 8%. At a dose of 1000 mg per day from this product, your intake falls within the studied range, but this is a small, not dramatic effect, and results vary between individuals. For overall immunity, an overall balanced diet and lifestyle are more important.