Chlorella

Chlorella vulgaris

ChlorellaceaeUbiquitous freshwater green microalga found globally in ponds, lakes, and soil worldwide; not region-specific; commercially cultivated in Japan, Taiwan, Germany, and USA

Description

overall appearance

Single-celled spherical green microalga, 2–10 micrometers in diameter; forms dense green suspensions in water; dried product is deep green powder with earthy, grassy odor; not visible individually to the naked eye — appears as a dark green mass when concentrated.

roots

Not applicable — unicellular organism with no root structure

stem

Not applicable — spherical unicellular organism; cell wall composed of complex polysaccharides and cellulosic material requiring mechanical disruption for bioavailability

leaves

Not applicable — contains a single large chloroplast occupying most of the cell volume; rich in chlorophyll a and b

flowers

Not applicable — reproduces asexually by autospore formation (each cell divides into 2–16 daughter cells)

fruits/seeds

Not applicable — asexual reproduction via autospores; daughter cells released when parent cell wall ruptures

Active Compounds

Chlorophyll a and b: 2–3% of dry weight — highest chlorophyll concentration of any known organismChlorella Growth Factor (CGF) — concentrated nucleotide/peptide complex containing DNA, RNA, amino acids, vitamins, and minerals; unique to chlorellaProtein: 45–60% of dry weight with complete amino acid profileBeta-1,3-glucan — immunostimulatory cell wall polysaccharideCarotenoids: beta-carotene, lutein, zeaxanthin, alpha-carotene, astaxanthin (in some strains)Vitamins: B12 (true cobalamin present, superior to spirulina), B1, B2, B6, C, K, folateOmega-3 fatty acids: alpha-linolenic acid and EPA in cell membranesMinerals: zinc, iron, magnesium, calcium, phosphorus, iodine

Traditional Uses

No ancient traditional use as it was not discovered until 1890 by Beyerinck and has only been used medicinally since the 1950s
Japanese post-WWII use: studied as a protein source alternative to meet post-war food scarcity needs; Hiroshima radiation recovery protocols included chlorella
Japanese longevity tradition: chlorella tablets widely taken as daily tonic since the 1960s in Japan where per-capita consumption remains highest globally
Macrobiotic diet tradition: incorporated as a cleansing and nutritional supplement by George Ohsawa and followers
Natural hygiene and naturopathic medicine: promoted since 1970s for detoxification of heavy metals, chemicals, and radiation
Japanese sumo and martial arts tradition: traditional performance supplement for recovery and stamina
Soviet-era research: studied as complete food source and immune modulator for cosmonauts
Alternative cancer support: used alongside conventional treatment in Japanese integrative oncology settings

Modern Applications

Heavy metal chelation: clinical studies show chlorella significantly reduces mercury, lead, and cadmium levels in blood and urine; studied in amalgam removal protocols
Immunostimulation: beta-1,3-glucan and CGF enhance NK cell activity and macrophage function in RCTs
Antioxidant effects: lutein, zeaxanthin, and chlorophyll reduce oxidative stress biomarkers in clinical studies
Lipid profile: meta-analyses show modest reduction in total cholesterol and LDL with 5–10 g daily
Blood pressure reduction: small RCTs show significant reduction in pre-hypertensive individuals
Blood glucose management: improves fasting glucose and HbA1c in type 2 diabetics (preliminary clinical data)
Pregnancy support: dioxin transfer to breast milk reduced in Japanese study with chlorella supplementation
Fibromyalgia: CGF supplementation reduced pain and improved quality of life in small controlled trial

⚠️ Safety Information

Contraindications

Autoimmune conditions (SLE, RA, MS): immunostimulatory beta-glucans may worsen autoimmune activity
Seafood/algae allergy: possible cross-reactivity
Iodine sensitivity or thyroid disease: iodine content may affect thyroid function
Anticoagulant therapy: high vitamin K content; monitor INR with warfarin
Celiac disease: cross-contamination risk in some products; choose certified gluten-free
Photosensitive skin conditions: chlorophyll increases photosensitivity in large doses

Side Effects

Gastrointestinal upset: gas, bloating, cramping, and diarrhea particularly at high doses or initiation
Green discoloration of stools (benign, expected from chlorophyll)
Acne and skin breakouts reported in some individuals starting supplementation
Photosensitivity reactions with sun exposure (particularly in fair-skinned individuals at high doses)
Fatigue or flu-like symptoms during first week of use (attributed to detoxification mobilization)
Rare allergic reactions including anaphylaxis in sensitized individuals

Drug Interactions

Warfarin and anticoagulants: vitamin K content antagonizes anticoagulation; monitor INR with consistent dosing
Immunosuppressants (tacrolimus, mycophenolate): immunostimulatory effects may reduce immunosuppressive efficacy
Levothyroxine: potential interference with thyroid hormone absorption if taken simultaneously
Chemotherapy agents: generally studied as compatible and potentially supportive, but inform oncologist
Calcium and iron supplements: algal mineral content may compete for absorption; separate by 2 hours

Parts Used

Whole cell dried biomass (powder, tablet)
Broken cell wall chlorella (mechanically processed for enhanced bioavailability)
Chlorella Growth Factor (CGF) — aqueous hot-water extract
Chlorella extract standardized to chlorophyll content