Isovitexin (C-Glycosyl Flavone · Neuroprotective · Anxiolytic)

Compound	Isovitexin
Chemical class	Polyphenol — C-Glycosyl Flavone (Apigenin-6-C-glucoside)
CAS	29702-25-8
Primary source	Passiflora incarnata (passionflower), Crataegus spp. (hawthorn), bamboo leaves
Key applications	Anxiolytic, neuroprotective, anti-inflammatory
Claim strength	Moderate
Typical form	Passionflower or hawthorn extract co-standardised with vitexin

Name origin: Iso- prefix indicates positional isomerism — isovitexin has the C-glucosyl group at C-6, whereas vitexin has it at C-8. Both are apigenin C-glucosides derived from the same botanical sources. Traditional use: As a co-constituent of passionflower and hawthorn alongside vitexin, isovitexin shares the traditional therapeutic context of these botanicals — passionflower as a nervine and hawthorn as a cardiac tonic. Research trajectory: Isovitexin has attracted growing research interest in its own right, particularly for neuroprotection (ischemic brain injury models), anxiolytic activity (GABA-A modulation), and ferroptosis regulation relevant to neurodegeneration. Commercial source: Accessible via passionflower and hawthorn extracts; bamboo leaf extract is emerging as a dedicated isovitexin-rich source.

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Evidence for Isovitexin Applications

Neuroprotective activity: In rodent ischemia-reperfusion models, isovitexin reduces infarct volume, attenuates neuroinflammation (NF-κB / NLRP3), and promotes neuronal survival through Nrf2 activation. Ferroptosis inhibition through GPX4 pathway stabilisation is a recently described neuroprotective mechanism. Claim strength: Moderate (convergent preclinical; no human data).

Anxiolytic and sedative activity: Isovitexin modulates GABA-A receptors in a manner consistent with anxiolytic activity in animal behavioural assays (elevated plus maze, forced swim test). Co-presence with vitexin in passionflower extract is thought to contribute to the botanical’s anxiolytic profile. Claim strength: Moderate.

Anti-inflammatory and antioxidant: Isovitexin suppresses COX-2, TNF-α, and IL-6 in macrophage models. Strong Nrf2 activation leading to HO-1 and NQO1 upregulation is documented — a cytoprotective mechanism relevant to oxidative stress management formulations. Claim strength: Moderate.

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Dosage & Formulator Specification

No clinical dose established for isolated isovitexin. In passionflower extract formulations, isovitexin is typically co-present with vitexin at approximately 0.5–1.5% of extract weight in commercial 3.5–4% vitexin extracts. The effective passionflower extract dose of 200–400 mg/day therefore delivers a small but consistent isovitexin fraction.

Formulators seeking isovitexin-enriched materials should enquire about bamboo leaf extract (Phyllostachys spp.) standardised to isovitexin — an emerging dedicated source. Bamboo leaf extracts typically contain 2–5% isovitexin with minimal vitexin content, allowing differentiated formulation.

Isovitexin as a C-6-glucoside is acid-stable and shows moderate aqueous solubility. Compatibility with tablet, capsule, and liquid formats is good. Co-formulation with vitexin in a ratio approximating the natural botanical matrix (vitexin:isovitexin ~3:1 in passionflower) is recommended for efficacy extrapolation from botanical clinical data.

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Frequently Asked Questions — Isovitexin

What is the practical difference between vitexin and isovitexin for a formulator?
Vitexin (C-8 glucoside) and isovitexin (C-6 glucoside) are positional isomers with similar but not identical bioactivity profiles. Both contribute to passionflower’s anxiolytic activity. Isovitexin has stronger documented neuroprotective and Nrf2-activating effects; vitexin has stronger cardiovascular evidence. Co-formulation reflects the natural botanical context.

Can I use bamboo leaf extract to standardise for isovitexin specifically?
Yes. Bamboo leaf extract (Phyllostachys spp.) is a clean source for isovitexin standardisation, with low vitexin content allowing HPLC-verified isovitexin specification. This is useful for formulators seeking the neuroprotective or Nrf2-activating activity of isovitexin specifically.

Is isovitexin included in the passionflower extract specification from Herbuno?
Herbuno’s passionflower extracts are standardised to vitexin (1.8% or 4%). Isovitexin is co-present in the botanical matrix but is not separately specified. Request a full flavone HPLC certificate of analysis for co-constituent quantification.

Does ferroptosis inhibition make isovitexin relevant for neurodegenerative disease formulations?
The ferroptosis-inhibition evidence (GPX4 pathway) is early-stage and preclinical. It does not support neurodegenerative disease therapeutic claims in supplement contexts. It is, however, a scientifically interesting mechanistic differentiator relevant to formulator R&D positioning and technical literature.

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Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

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