# Ogo (Gracilaria parvisipora)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/ogo
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 2 / 10
**Category:** Marine-Derived
**Also Known As:** Gracilaria parvisipora, Hawaiian ogo, red seaweed, limu ogo, Pacific red algae, Gracilaria seaweed

## Overview

Ogo (Gracilaria parvispora) is a red seaweed containing bioactive polysaccharides including carrageenan and agar that demonstrate [anti-inflammatory](/ingredients/condition/inflammation) properties. Research on related Gracilaria species shows these compounds inhibit inflammatory markers TNF-α and IL-6 while supporting [immune function](/ingredients/condition/immune-support).

## Health Benefits

• [Anti-inflammatory](/ingredients/condition/inflammation) effects: Preclinical studies on related Gracilaria species show reduced inflammation markers (TNF-α, IL-6, COX-1/2) in animal models
• [Immune system](/ingredients/condition/immune-support) support: Animal studies demonstrate enhanced CD8+ cells, IL-2, and IFN-γ production in tumor-bearing mice
• Potential anti-cancer properties: In vitro studies show apoptosis induction and cell cycle arrest in lung cancer cells (preliminary evidence only)
• [Prebiotic](/ingredients/condition/gut-health) effects: May support gut microbiota and SCFA production based on genus-wide research
• Mineral content: Classified as USDA nutrient-dense food, though contamination with heavy metals (43.3 mg Pb/kg) poses safety concerns

## Mechanism of Action

Ogo's polysaccharides, primarily carrageenan and sulfated galactans, modulate [inflammatory pathway](/ingredients/condition/inflammation)s by inhibiting cyclooxygenase-1 and cyclooxygenase-2 enzymes. These compounds also enhance immune cell activation by stimulating CD8+ [T-cell](/ingredients/condition/immune-support) proliferation and increasing production of interleukin-2 and interferon-gamma cytokines.

## Clinical Summary

Current evidence for Ogo comes primarily from preclinical studies on related Gracilaria species rather than human trials. Animal studies show reduced [inflammatory](/ingredients/condition/inflammation) markers TNF-α and IL-6, along with enhanced immune cell activity in tumor-bearing mice. However, no published human clinical trials specifically examine Gracilaria parvispora's therapeutic effects. The evidence remains preliminary and requires human validation studies.

## Nutritional Profile

{"macronutrients": {"protein": "Approximately 5-10% of dry weight", "fiber": "Approximately 30-40% of dry weight, mainly as soluble fiber"}, "micronutrients": {"vitamins": {"Vitamin C": "Approximately 5-10 mg per 100g", "Vitamin A": "Trace amounts"}, "minerals": {"Calcium": "Approximately 200-300 mg per 100g", "Magnesium": "Approximately 100-150 mg per 100g", "Iron": "Approximately 2-5 mg per 100g"}}, "bioactive_compounds": {"Phycocolloids": "Includes agar, with concentrations varying based on processing", "Polyphenols": "Approximately 1-2% of dry weight, contributing to [antioxidant](/ingredients/condition/antioxidant) properties"}, "bioavailability_notes": "The bioavailability of minerals like iron may be enhanced by the presence of vitamin C, while the fiber content can aid in [digestion](/ingredients/condition/gut-health) and improve nutrient absorption. The presence of phycocolloids like agar may also influence the bioavailability of certain nutrients."}

## Dosage & Preparation

No clinically studied human dosages exist. Animal studies used 3-27 mg/kg orally for [anti-inflammatory](/ingredients/condition/inflammation) effects and 10 mg/kg intraperitoneally for [immunomodulat](/ingredients/condition/immune-support)ion. Human dosing remains undefined. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Ogo is generally recognized as safe when consumed as food, but concentrated extracts lack safety data. High iodine content may interfere with [thyroid](/ingredients/condition/hormonal) medications or worsen hyperthyroidism. Potential anticoagulant effects from sulfated polysaccharides could interact with blood-thinning medications. Pregnant and nursing women should avoid supplemental doses due to insufficient safety data.

## Scientific Research

No human clinical trials exist for G. parvisipora; all evidence comes from preclinical studies on other Gracilaria species. Animal studies include H22 hepatoma-transplanted mice showing tumor reduction with oral SP treatment, and rat models demonstrating [anti-inflammatory](/ingredients/condition/inflammation) effects at 3-27 mg/kg doses.

## Historical & Cultural Context

Ogo has been traditionally consumed as a nutrient-dense food in Pacific Island cultures, particularly Hawai'i, where it's incorporated into dishes like poke. No documented traditional medicinal use exists specifically for G. parvisipora, though marine algae have been used in folk remedies.

## Synergistic Combinations

Spirulina, Chlorella, Kelp, Vitamin C, Selenium

## Frequently Asked Questions

### What is the difference between Ogo and other seaweeds like nori?

Ogo is a red seaweed (Gracilaria parvispora) containing carrageenan and sulfated polysaccharides, while nori is typically from Porphyra species with different polysaccharide profiles. Ogo has higher concentrations of anti-inflammatory compounds compared to most green seaweeds.

### How much iodine does Ogo contain?

Gracilaria species typically contain 150-1,500 mcg iodine per gram dry weight, though specific data for Gracilaria parvispora varies by harvest location. This represents 100-1,000% of the daily iodine requirement in just one gram of dried seaweed.

### Can Ogo help with arthritis inflammation?

Preclinical studies show related Gracilaria species reduce inflammatory markers TNF-α and IL-6 that are elevated in arthritis. However, no human studies have specifically tested Ogo for arthritis, so clinical benefits remain unproven.

### Is Ogo safe to eat during pregnancy?

While Ogo is consumed as food in many cultures, its high iodine content and lack of safety studies during pregnancy make supplemental doses inadvisable. Occasional food consumption is likely safe, but pregnant women should consult healthcare providers.

### What compounds in Ogo provide the anti-inflammatory effects?

The primary bioactive compounds are sulfated polysaccharides including carrageenan, agar, and sulfated galactans. These compounds inhibit cyclooxygenase enzymes and reduce production of inflammatory cytokines TNF-α and interleukin-6.

### What does the current clinical evidence show about Ogo's anti-cancer potential in humans?

While in vitro studies on Gracilaria species show promising apoptosis induction and cell cycle arrest in lung cancer cells, human clinical trials on Ogo are extremely limited and not yet published in peer-reviewed literature. Most anti-cancer evidence remains preclinical (laboratory-based), meaning effectiveness in humans has not been established. Ogo should not be considered a cancer treatment substitute for conventional medical therapies.

### Who should avoid Ogo supplementation, and are there specific populations at higher risk for adverse effects?

Individuals with shellfish or seaweed allergies should avoid Ogo due to cross-reactivity risk, and those with thyroid disorders (beyond the iodine consideration already covered) should consult a healthcare provider before supplementing. People taking blood thinners or immunosuppressant medications may need to exercise caution, as seaweeds can have mild anticoagulant properties and may enhance immune responses. Those with kidney disease should be careful due to Ogo's mineral content.

### How does the immune-boosting mechanism of Ogo (CD8+ cells, IL-2, IFN-γ) differ from other seaweed supplements?

Ogo's polysaccharide compounds and bioactive peptides appear to preferentially stimulate CD8+ T-cell activation and interferon-gamma production in animal models, whereas other seaweeds like wakame or kelp may activate broader innate immunity pathways. This targeted adaptive immune response differs in mechanism from the more general immunomodulatory effects documented in many common macroalgae supplements. However, direct head-to-head human comparative studies are lacking.

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