Health Column
Loganin in Cornus Fruit: What to Know Before You Learn the Compound’s Name
The name “loganin” appears often in health information. Loganin is a compound found in Cornus fruit (Cornus officinalis, Asiatic dogwood). The name has become familiar, but how to read this compound is not widely understood.
What kind of compound is loganin?
Loganin belongs to a group of plant compounds called “iridoid glycosides,” which have a structure in which a sugar is attached to a terpene skeleton made by plants. Cornus fruit contains loganin and morroniside as its representative iridoids, and these serve as markers that distinguish Cornus fruit from other fruits.
Cornus fruit is harvested when it ripens red in late autumn; the seeds are removed and the flesh is dried for use. Because removing the seeds one by one is laborious, it has long been regarded as a precious medicinal ingredient.
What “marker compound” means
The Korean Pharmacopoeia sets a quality standard for Cornus fruit that the sum of loganin and morroniside must be at least 1.2%. A compound used to check whether a raw material is genuine and meets quality standards in this way is called a marker compound.
A marker compound is different from an active compound. An active compound is the one that produces an effect; a marker compound is a gauge for measuring whether the raw material was made properly. A consistent marker compound content means that each production run yielded raw material of the same quality. It does not mean that this one compound produces all of the effects.
What research says
Some studies used loganin alone. Researchers at Ajou University School of Medicine observed that, in preadipocytes and an obese mouse model, loganin lowered the expression of genes that drive fat cell differentiation (PPARγ, C/EBPα and others). The same research group reported results in a similar direction for morroniside, another compound in Cornus fruit, in cell and mouse experiments.
Evidence that is meaningful for humans comes from trials in humans. In a 12-week human trial in overweight women (147 enrolled, 76 completed, with diet and exercise), a combined extract of Cornus fruit and Ribes fasciculatum leaf mixed in a 7:3 ratio significantly reduced body fat mass and body fat percentage compared with the placebo group. This trial was conducted not with loganin alone but with a combined extract at 1,600 mg per day. This means that when talking about effects, the benchmark is not a single compound but the whole raw material used in the trial.
What to check when you see a compound name
- A higher loganin content is not necessarily better. A marker compound is a standard for the consistency of quality.
- Look at which trial confirmed it. The weight of the evidence differs depending on whether it comes from a cell or animal study or a trial in humans.
- Check the wording approved by Korea’s Ministry of Food and Drug Safety (MFDS). The function of a health functional food (a Korean regulatory category) can be labeled only with the wording the MFDS has approved for each ingredient.
- MFDS, Korean Pharmacopoeia, “Cornus Fruit”
- Jeon H, et al. Inhibitory Effects of Loganin on Adipogenesis In Vitro and In Vivo. Int J Mol Sci. DOI 10.3390/ijms24054752
- Oh KI, et al. Anti-adipogenic and anti-obesity effects of morroniside in vitro and in vivo. Biomed Pharmacother. DOI 10.1016/j.biopha.2024.116762
- Park E, et al. Efficacy and Safety of Combined Extracts of Cornus officinalis and Ribes fasciculatum for Body Fat Reduction in Overweight Women. J Clin Med. DOI 10.3390/jcm9113629