# Syringic Acid

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/syringic-acid
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-19
**Evidence Score:** 4 / 10
**Category:** Compound
**Also Known As:** 4-Hydroxy-3,5-dimethoxybenzoic acid, 3,5-Dimethoxygallic acid, 3,5-Dimethoxy-4-hydroxybenzoic acid, Syringic acid methyl ester precursor, C9H10O5, SA, 3,5-DMHBA

## Overview

Syringic acid is a naturally occurring phenolic acid found in foods like wine, maple syrup, and olives, characterized by a syringyl functional group with two methoxy substituents on its benzene ring. It exerts antioxidant effects by scavenging [free radical](/ingredients/condition/antioxidant)s and modulates carbohydrate [metabolism](/ingredients/condition/weight-management) by inhibiting α-amylase and α-glucosidase enzymes.

## Health Benefits

• [Antioxidant activity](/ingredients/condition/antioxidant) - Shows both antioxidant and prooxidant properties in phenolic extracts (preclinical evidence only)
• Blood sugar management - Inhibits α-amylase and α-glucosidase enzymes involved in carbohydrate [metabolism](/ingredients/condition/weight-management) (in vitro studies only)
• Cellular protection - Protects RGC-5 cells from H₂O₂-induced apoptosis via PI3K/Akt signaling pathway (cell-based studies)
• Anti-cancer potential - Demonstrates antimitogenic effects on cancer cells (IC₅₀ = 0.95-1.2 mg/mL) with low toxicity to normal fibroblasts (preclinical data)
• Enzyme inhibition - Inhibits aldose reductase (IC₅₀ = 213 μg/ml) and proteasome activities (laboratory studies only)

## Mechanism of Action

Syringic acid donates hydrogen atoms to neutralize [reactive oxygen species](/ingredients/condition/antioxidant), though under certain pro-oxidant conditions it can paradoxically generate free radicals within phenolic extract mixtures. It competitively inhibits the [digestive enzyme](/ingredients/condition/gut-health)s α-amylase and α-glucosidase, slowing the breakdown of dietary carbohydrates into glucose and thereby attenuating postprandial blood sugar spikes. Additionally, it has demonstrated cytoprotective effects in retinal ganglion cells (RGC-5 line), potentially through suppression of oxidative stress-induced apoptotic pathways.

## Clinical Summary

Current evidence for syringic acid is derived exclusively from in vitro cell studies and animal models, with no published human clinical trials as of 2024. In vitro enzyme inhibition assays have shown measurable reductions in α-amylase and α-glucosidase activity, but IC50 values and pharmacokinetic relevance to humans remain poorly characterized. RGC-5 cellular protection studies are preliminary and conducted under controlled laboratory conditions that do not replicate human physiology. The overall evidence base is insufficient to support therapeutic claims, and controlled human trials are needed before efficacy can be established.

## Nutritional Profile

Syringic acid (3,5-dimethoxy-4-hydroxybenzoic acid) is a low-molecular-weight phenolic acid (molecular weight: 198.17 g/mol) belonging to the hydroxybenzoic acid subclass of polyphenols. It is not a macronutrient or direct dietary supplement in isolated form but occurs naturally as a bioactive phytochemical. Found in trace-to-moderate concentrations in various food sources: red wine (0.1–2.5 mg/L), olive oil (0.5–3.0 mg/kg), vinegar, dates, and certain cereal brans (wheat bran: ~0.2–1.0 mg/g dry weight). Also present in medicinal plants including Acanthopanax species and Dendrobium nobile. Contains no protein, fat, or fiber content as a pure compound. Micronutrient contribution is negligible when consumed via whole foods. Key bioactive identity: phenolic hydroxyl group at C-4 and methoxy groups at C-3 and C-5, which confer [free radical scaveng](/ingredients/condition/antioxidant)ing capacity (DPPH IC50 values reported in the range of 50–200 µM in vitro depending on assay conditions). Bioavailability: absorbed in the small intestine; undergoes phase II conjugation (glucuronidation, sulfation, methylation) in intestinal epithelium and liver; plasma concentrations after dietary intake estimated at low nanomolar-to-low micromolar range. Subject to colonic microbial [metabolism](/ingredients/condition/weight-management), producing smaller phenolic metabolites. Limited human pharmacokinetic data available; most bioavailability data derived from rat models showing urinary excretion of conjugated forms within 4–8 hours post-ingestion.

## Dosage & Preparation

No clinically studied dosage ranges exist for human consumption. In vitro studies have used concentrations of 0.95-1.2 mg/mL for cellular effects and 213 μg/mL for enzyme inhibition, but these cannot be extrapolated to human dosing. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

No formal human safety studies or established tolerable upper intake levels exist for isolated syringic acid supplementation. Because it inhibits carbohydrate-digesting enzymes, concurrent use with antidiabetic medications such as metformin, acarbose, or insulin could theoretically potentiate hypoglycemic effects, warranting caution. Its dual [antioxidant](/ingredients/condition/antioxidant) and pro-oxidant behavior in complex phenolic mixtures raises theoretical concerns about oxidative interactions at high concentrations, though this has not been demonstrated in vivo. Pregnant and breastfeeding individuals should avoid isolated syringic acid supplements due to a complete absence of safety data in these populations.

## Scientific Research

No human clinical trials, randomized controlled trials, or meta-analyses have been conducted on syringic acid. All available evidence is limited to preclinical studies including in vitro enzyme assays and cell-based models demonstrating various biological activities.

## Historical & Cultural Context

No historical or traditional medicinal uses are documented in the available research. Syringic acid has only been identified through modern scientific analysis as a plant metabolite with potential pharmacological properties.

## Synergistic Combinations

Gallic acid, quercetin, resveratrol, curcumin, EGCG

## Frequently Asked Questions

### What foods are naturally high in syringic acid?

Syringic acid occurs naturally in red wine, maple syrup, olive oil, dates, and various cereal grains including sorghum and millet. It is also found in certain medicinal plants such as Acanthopanax species and Lonicera japonica. Dietary intake from these whole foods is considered safe and distinct from consuming isolated syringic acid supplements.

### Can syringic acid lower blood sugar levels?

In vitro studies show syringic acid inhibits α-amylase and α-glucosidase, the enzymes that break down carbohydrates into absorbable glucose, which could theoretically reduce postprandial blood sugar spikes. However, these findings come exclusively from test-tube experiments, and no human clinical trials have confirmed a blood sugar-lowering effect at any specific dose. It should not be used as a substitute for prescribed diabetes medications.

### Is syringic acid the same as syringin?

No, syringic acid and syringin are distinct compounds. Syringic acid (4-hydroxy-3,5-dimethoxybenzoic acid) is a free phenolic acid, while syringin is a phenylpropanoid glycoside in which sinapyl alcohol is bound to glucose. Both are found in plant sources, but they have different molecular structures, bioavailability profiles, and reported biological activities.

### Does syringic acid have any antioxidant properties?

Syringic acid demonstrates free radical scavenging activity in laboratory assays, attributed to its hydroxyl group donating hydrogen atoms to neutralize reactive oxygen species. However, research also documents pro-oxidant behavior when it is present within complex phenolic extract mixtures, meaning its net antioxidant effect is context-dependent. All antioxidant evidence is preclinical, and whether it provides meaningful antioxidant benefit in the human body has not been tested.

### What is the typical dosage of syringic acid in supplements?

There is currently no established or recommended dosage for syringic acid supplementation because human clinical trials defining effective or safe doses have not been conducted. Preclinical studies use highly variable concentrations that are not directly translatable to human dosing. Anyone considering a syringic acid supplement should consult a healthcare provider, as no regulatory body has set guidelines for its use.

### Is syringic acid safe for children?

There is limited safety data on syringic acid supplementation in children, as most research has been conducted in cell cultures and animal models rather than pediatric populations. While syringic acid occurs naturally in foods like blueberries and whole grains that children consume regularly, the safety of concentrated supplement forms in children has not been established. Consult a pediatrician before giving syringic acid supplements to children.

### Does syringic acid interact with diabetes medications?

Syringic acid may theoretically interact with diabetes medications since in vitro studies show it inhibits α-amylase and α-glucosidase enzymes involved in carbohydrate digestion, potentially enhancing glucose-lowering effects. This combination could increase the risk of hypoglycemia when used with medications like metformin or sulfonylureas. Anyone taking diabetes medication should consult their healthcare provider before supplementing with syringic acid.

### How strong is the clinical evidence supporting syringic acid's health claims?

Current evidence for syringic acid is limited primarily to in vitro (test tube) and cell-based studies, with no published human clinical trials. While preclinical research suggests potential antioxidant and anti-cancer properties, these findings cannot be considered reliable evidence of efficacy in humans without rigorous clinical testing. Most marketed claims about syringic acid remain unverified and require further research.

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*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
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