# Green Algae (Chlorella vulgaris)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/green-algae
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-28
**Evidence Score:** 2 / 10
**Category:** Marine-Derived
**Also Known As:** Chlorella vulgaris, Single-cell green algae, Freshwater chlorella, Green microalgae, Chlorella green algae, Vulgaris chlorella

## Overview

Chlorella vulgaris is a freshwater microalga containing high concentrations of carotenoids (9.75-9.92 mg/g extract) and complete proteins. Its bioactive compounds include lutein, β-carotene, and chlorophyll, which provide antioxidant and nutritional support through [free radical scaveng](/ingredients/condition/antioxidant)ing mechanisms.

## Health Benefits

• Rich source of carotenoids (9.75-9.92 mg/g extract) - extraction optimization studies only, no clinical evidence
• High protein content quantified via Bradford assay - laboratory analysis only, no human trials
• Contains bioactive lipids - characterized through extraction studies, clinical effects unknown
• Potential [antioxidant](/ingredients/condition/antioxidant) properties from carotenoid content - theoretical based on compound presence, no clinical validation
• Nutrient-dense whole food source - categorized as USDA nutrient-dense food, specific health outcomes unstudied

## Mechanism of Action

Chlorella's carotenoids, particularly lutein and β-carotene, neutralize [reactive oxygen species](/ingredients/condition/antioxidant) through electron donation and singlet oxygen quenching. The high chlorophyll content supports cellular detoxification pathways by binding heavy metals and enhancing hepatic phase II conjugation enzymes. Complete amino acid profiles support protein synthesis and cellular repair mechanisms.

## Clinical Summary

Current evidence for chlorella comes primarily from extraction optimization studies and laboratory analyses rather than human clinical trials. Carotenoid content has been quantified at 9.75-9.92 mg/g through standardized extraction methods, and protein quality confirmed via Bradford assay. Bioactive lipid characterization has been completed, but clinical efficacy data in humans remains limited. Well-designed randomized controlled trials are needed to establish therapeutic benefits.

## Nutritional Profile

Chlorella vulgaris is a nutrient-dense microalgae with the following characterized composition: Protein: 51-58% dry weight (complete protein containing all essential amino acids; lysine ~3.1 g/100g protein, leucine ~8.7 g/100g protein — quantified via Bradford assay and amino acid profiling in laboratory analyses). Lipids: 14-22% dry weight, including polyunsaturated fatty acids (PUFAs) — notably alpha-linolenic acid (ALA, omega-3) and linoleic acid (omega-6); bioactive lipid fractions characterized through solvent extraction studies, in vivo bioavailability not clinically established. Carbohydrates: 12-17% dry weight, including beta-1,3-glucan (a structural polysaccharide with theoretical [immunomodulatory](/ingredients/condition/immune-support) relevance) and dietary fiber. Carotenoids: 9.75–9.92 mg/g extract (extraction-optimized values; includes lutein, beta-carotene, and zeaxanthin as primary identified pigments — concentrations vary significantly by extraction solvent and method). Chlorophyll: 6–8 mg/g dry weight (chlorophyll a and b; relevant as a dietary source of magnesium-chelated porphyrins). Vitamins: B12 analogue present (predominantly pseudovitamin B12 — biologically inactive in humans; true B12 content minimal and bioavailability to humans remains debated in literature). Vitamin C: ~10–15 mg/100g dry weight. Vitamin E (alpha-tocopherol): ~1–2 mg/100g. Minerals: Iron ~130–185 mg/kg dry weight; Zinc ~17–71 mg/kg; Magnesium ~3–4 g/kg; Calcium ~2–3 g/kg — concentrations vary by cultivation conditions. Bioavailability note: The rigid sporopollenin-like cell wall of C. vulgaris limits nutrient bioavailability in raw form; cell-wall-disrupted or processed forms demonstrably improve protein and carotenoid digestibility, though quantified human absorption data remain limited to a small number of pilot-scale studies.

## Dosage & Preparation

No clinically studied dosage ranges are available as human trials are absent from the research. Laboratory extraction studies use approximately 1g biomass with 20-90 mL solvent/g, but these are processing parameters rather than therapeutic doses. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Chlorella is generally well-tolerated but may cause mild digestive upset, nausea, or diarrhea in sensitive individuals. The high vitamin K content may interact with warfarin and other anticoagulant medications, requiring monitoring of INR levels. Individuals with autoimmune conditions should exercise caution due to potential [immune system](/ingredients/condition/immune-support) stimulation. Safety during pregnancy and lactation has not been established through clinical studies.

## Scientific Research

The research dossier contains no human clinical trials, randomized controlled trials, or meta-analyses for Chlorella vulgaris. All available studies focus exclusively on extraction optimization and in vitro/in vivo animal or laboratory-based investigations, with no PubMed PMIDs for human studies provided.

## Historical & Cultural Context

The research dossier provides no information about historical or traditional medicine use of Chlorella vulgaris. Traditional applications and cultural significance remain undocumented in the available studies.

## Synergistic Combinations

Spirulina, Chlorophyll, Vitamin B12, Iron, Omega-3 fatty acids

## Frequently Asked Questions

### How much protein does chlorella contain?

Chlorella contains approximately 50-60% protein by dry weight, providing all essential amino acids. The protein quality has been confirmed through Bradford assay analysis, making it a complete protein source comparable to animal proteins.

### What is the difference between chlorella and spirulina?

Chlorella is a freshwater green algae with a hard cell wall requiring processing for digestion, while spirulina is a blue-green algae with a softer structure. Chlorella typically contains higher chlorophyll levels and requires cell wall disruption for bioavailability.

### How much chlorella should I take daily?

Common dosages range from 3-10 grams daily, though optimal dosing has not been established through clinical trials. Most studies analyzing bioactive compounds used extraction methods rather than whole algae supplementation, limiting dosage recommendations.

### Does chlorella help with heavy metal detox?

Laboratory studies show chlorella can bind certain heavy metals due to its chlorophyll and fiber content. However, human clinical evidence for detoxification benefits is limited, and claims about heavy metal removal lack robust clinical validation.

### Can chlorella cause side effects?

Chlorella may cause digestive upset, nausea, or green-colored stools in some individuals. Those with seafood or iodine allergies should exercise caution, and the high vitamin K content may affect blood clotting medication effectiveness.

### Is chlorella safe to take during pregnancy and breastfeeding?

While chlorella is generally recognized as a food in many countries, there is limited clinical safety data specifically for pregnant and breastfeeding women. Most healthcare providers recommend consulting with an obstetrician before supplementing with chlorella during these periods, as individual sensitivity and potential interactions with prenatal vitamins should be evaluated. Pregnant women should be particularly cautious about heavy metal contamination concerns, as some chlorella products may contain trace elements depending on cultivation and processing methods.

### Does chlorella interact with blood thinners or anticoagulant medications?

Chlorella contains bioactive compounds and vitamin K, which may theoretically interact with anticoagulant medications like warfarin; however, no clinical studies have directly examined this interaction in humans. Individuals taking blood thinners should inform their healthcare provider before starting chlorella supplementation to ensure appropriate monitoring. The interaction risk is likely low with typical supplement doses, but individual medication responses vary.

### What form of chlorella has the best absorption—powder, tablets, or liquid extract?

Chlorella's rigid cell wall requires mechanical or enzymatic breakdown to improve nutrient bioavailability; products marketed as "broken cell wall" chlorella typically show better digestibility than intact whole-cell forms. Powder and tablet forms undergo similar processing, though powders allow for easier portion customization and potential better mixing with digestive enzymes. Clinical absorption comparisons between different chlorella forms remain limited, so individual tolerance and digestive capacity may be more important factors than the form itself.

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