Grape Seed Extract

Grape Seed Extract

Composition

Polyphenols

• Catechin and Epicatechin
  • There are specially manufactured catechin-rich versions of Grape Seed Extact which are engineered to contain high concentrations of monomeric catechins.
• Catechin ©
• Epicatechin gallate (ECG)
• Procyanidin B1
• Procyanidin B2
• Procyanidin C1
• Rutin
  • Chemical characterization by HPLC-DAD has identified catechin and rutin as the predominant phenolic constituents of grape seed extract.^[1]

Healing Properties

Antioxidant

Grape seed extract significantly reduces reactive species (RS) levels in the prefrontal cortex, hippocampus, and small intestine, demonstrating antioxidant activity in both central and peripheral stress-sensitive tissues.^[1:1]

Anti-Obesity

Neuroprotective

Grape seed extract exerts neuroprotective effects by attenuating oxidative stress and neuroinflammatory responses in brain regions including the prefrontal cortex and hippocampus.^[1:2]

• GSE modulates the TLR4/NF-κB signaling axis, downregulating the mRNA expression of proinflammatory cytokines including IL-1β and NF-κB in the hippocampus, prefrontal cortex, and small intestine.^[1:3]
• GSE markedly reduces IFN-γ expression in the hippocampus, prefrontal cortex, and small intestine, indicating a systemic anti-neuroinflammatory effect.^[1:4]

Mental Health

Grape seed extract has demonstrated antidepressant-like effects in animal studies, reversing behavioral alterations induced by acute restraint stress in the Tail Suspension Test (TST) without impairing locomotion in the Open Field Test (OFT).^[1:5]

Lung Health

Grape seed extract has been shown to increase the content of glycogen (a form of energy storage, the main storage form of glucose in the body).^[2]

Protects Lung Tissue

Grape Seed Extract has been shown to improve alternations in the lung tissue ultrastructures.^[2:1]

Liver Health

Extract of grape seed has the ability to reduce toxic effects on the liver.

Kidney Health

Extract of grape seed has the ability to reduce toxic effects on the kidneys.

Cardiovascular Health

Extract of grape seed has the ability to reduce toxic effects on the heart.

Disease / Symptom Treatment

Lung Damage

Grape seed extract has an ameliorative effect against pulmonary damage.^[2:2]

• Grape seed extract has been shown to reduce the extent of lung damage.^[2:3]

Diabetes

Grape Seed extract contains catechins which have anti-diabetic properties.^[3]

Glucose Regulation

(Carbohydrate Digestion, Glucosidase inhibitor)

The Catechins and procyanidins found in grape seed extract strongly inhibit α-amylase and α-glucosidase activity (these are glucosidases required for starch digestion). The effect of this inhibition is to help reduce the flow of glucose from complex dietary carbohydrates into the bloodstream, diminishing the postprandial (after eating) effect of starch consumption on blood glucose levels.^[3:1]

Grape seed extract strongly inhibits both α-amylase and α-glucosidase activity, with equal and much higher potency, respectively, than acarbose (a pharmacological glucosidase inhibitor).^[3:2]

Depression

Grape seed extract (GSE) has been shown to exhibit antidepressant-like activity in an acute restraint stress (ARS) model of stress-induced depressive-like behavior in female mice.^[1:6]

Antidepressant-like Effects

• GSE pretreatment effectively reverses behavioral alterations induced by restraint stress, significantly reducing immobility time in the Tail Suspension Test (TST) — a validated measure of depressive-like behavior — without impairing locomotion.^[1:7]
• The antidepressant-like effects of GSE are associated with its ability to modulate the HPA axis, oxidative stress, and neuroinflammatory responses.^[1:8]

HPA Axis Modulation

The hypothalamic-pituitary-adrenal (HPA) axis plays a central role in the physiological stress response. GSE pretreatment reduced plasma corticosterone concentrations in stressed mice, suggesting that its antidepressant-like mechanism involves modulation of HPA axis activity.^[1:9]

• Elevated corticosterone disrupts mitochondrial function and promotes lipid peroxidation, protein oxidation, and DNA damage, ultimately impairing neuronal integrity and synaptic plasticity. GSE attenuates this cascade.^[1:10]
• Brain regions with high glucocorticoid receptor density, such as the hippocampus and prefrontal cortex, are particularly vulnerable to stress-induced oxidative damage; GSE’s protective effects were demonstrated in both these regions.^[1:11]

Neuroinflammation

• Acute restraint stress increased NF-κB and IL-1β mRNA expression in the hippocampus, prefrontal cortex, and small intestine; GSE pretreatment significantly reduced both markers, indicating effective modulation of the TLR4/NF-κB signaling axis in central and peripheral tissues.^[1:12]
• Acute restraint stress induced significant upregulation of IFN-γ mRNA expression; GSE pretreatment markedly reduced IFN-γ expression in the same regions, indicating a systemic anti-inflammatory effect. IFN-γ serves as a crucial neuroimmune mediator linking peripheral inflammation to CNS dysfunction in depression.^[1:13]

Gut–Brain Axis Modulation

• GSE may protect intestinal integrity by attenuating intestinal oxidative and inflammatory signaling, thereby limiting bacterial lipopolysaccharide translocation and activation of TLR4 receptors, which amplify NF-κB–mediated inflammation.^[1:14]
• GSE’s protective effects on intestinal tissues provide mechanistic insight into how it may modulate the microbiota–gut–brain axis, a key pathway implicated in depression.^[1:15]