California Gold Nutrition Ergothioneine Mushroom Complex with Organic Maitake, Organic Oyster, Organic Lion's Mane Mushroom Extracts and L-Ergothioneine, 90 Veggie Capsules supplement bottle
California Gold Nutrition

Ergothioneine Mushroom Complex with Organic Maitake, Organic Oyster, Organic Lion's Mane Mushroom Extracts and L-Ergothioneine, 90 Veggie Capsules

What We Researched
4 active ingredients analyzed · 4 inactive ingredients decoded · 1 retailer compared · Last updated: Mar 2026
73
Product Score Fair
79
Brand Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Organic Maitake Mushroom Extract (Grifola frondosa) (fruiting body) 150 mg †
Organic Oyster Mushroom Extract (Pleurotus ostreatus) (fruiting body) 150 mg †
Organic Lion's Mane Mushroom Extract (Hericium erinaceus) (fruiting body) 100 mg †
L-Ergothioneine 5 mg †
Bioavailability Good

Absorption Rating

  • Organic Maitake Mushroom Extract (Grifola frondosa) (fruiting body) Good
  • Organic Oyster Mushroom Extract (Pleurotus ostreatus) (fruiting body) Poor
  • Organic Lion's Mane Mushroom Extract (Hericium erinaceus) (fruiting body) Fair
  • L-Ergothioneine Good
Other Ingredients Excellent

Fillers & Additives

  • Modified Cellulose (Hypromellose Veggie Capsule)
  • Microcrystalline Cellulose
  • Silicon Dioxide (Silica)
  • Stearic Acid
Efficacy Poor

Dosage Analysis

  • Organic Maitake Mushroom Extract (Grifola frondosa) (fruiting body) 150 mg Under-dosed
  • Organic Lion's Mane Mushroom Extract (Hericium erinaceus) (fruiting body) 100 mg Under-dosed
  • L-Ergothioneine 5 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Organic Maitake Mushroom Extract (Grifola frondosa) (fruiting body) 150 mg †
Organic Oyster Mushroom Extract (Pleurotus ostreatus) (fruiting body) 150 mg †
Organic Lion's Mane Mushroom Extract (Hericium erinaceus) (fruiting body) 100 mg †
L-Ergothioneine 5 mg †

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Modified Cellulose (Hypromellose Veggie Capsule) Safe

It is used as a vegetarian alternative to gelatin capsules.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Silicon Dioxide (Silica) Generally_safe

It is used as a flow agent to prevent clumping and improve powder flow.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Price Comparison

iHerb $22.25 $0.25 / serving
Best Price

Price History

Tracked across major retailers. Updated periodically.

$24$23$22$21$20 Mar 12 $22.25
iHerb

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
California Gold Nutrition

Founded 2013 · Irvine, California, United States · 406 products · californiagoldnutrition.com/

Transparency

5 claims
Third Party Testing Claim — Verified Source
Coa Availability — Verified Source
Testing Lab Disclosure — Claimed
In House Testing — Verified Source

Violation History

6 incidents
Recall California Gold Nutrition Daily Prenatal Multi, Ultamins Women's Multivitamin, and Ultamins Women's 50+ Multivitamin2025-06-26Source
Fda Warning Public health warning against the purchase and consumption of unregistered food supplement: CALIFORNIA GOLD NUTRITION Baby Liquid Vitamin D3.2025-01-10Source
Fda Warning Public health warning against the purchase and consumption of unregistered food product: CALIFORNIA GOLD NUTRITION Stabilized R-Lipolic Acid.2024-04-12Source
Fda Warning Public health warning against the purchase and consumption of unregistered food product: CALIFORNIA GOLD NUTRITION Silymarin Complex.2024-04-12Source
Fda Warning Public health warning against the purchase and consumption of unregistered food supplement: CALIFORNIA GOLD NUTRITION PQQ 20mg.2024-02-01Source
Fda Warning Public health warning against the purchase and consumption of unregistered food supplement: CALIFORNIA GOLD NUTRITION DAIRY ENZYMES.2019-09-26Source
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Frequently Asked Questions
Is California Gold Nutrition Ergothioneine Mushroom Complex with Organic Maitake, Organic Oyster a good supplement?

California Gold Nutrition Ergothioneine Mushroom Complex with Organic Maitake, Organic Oyster, Organic Lion's Mane Mushroom Extracts and L-Ergothioneine, 90 Veggie Capsules received a product quality score of 73/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 4 active ingredients with 90 servings per container. Of the 4 inactive ingredients, 3 are rated safe and 0 are flagged for review. The manufacturer, California Gold Nutrition, holds a brand trust score of 79/100.

What are the ingredients in California Gold Nutrition Ergothioneine Mushroom Complex with Organic Maitake, Organic Oyster?

California Gold Nutrition Ergothioneine Mushroom Complex with Organic Maitake, Organic Oyster contains 4 active ingredients: Organic Maitake Mushroom Extract (Grifola frondosa) (fruiting body) (150 mg), Organic Oyster Mushroom Extract (Pleurotus ostreatus) (fruiting body) (150 mg), Organic Lion's Mane Mushroom Extract (Hericium erinaceus) (fruiting body) (100 mg), L-Ergothioneine (5 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is California Gold Nutrition Ergothioneine Mushroom Complex with Organic Maitake, Organic Oyster safe to take?

California Gold Nutrition Ergothioneine Mushroom Complex with Organic Maitake, Organic Oyster, Organic Lion's Mane Mushroom Extracts and L-Ergothioneine, 90 Veggie Capsules has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is California Gold Nutrition a trustworthy supplement brand?

California Gold Nutrition receives a brand trust score of 79/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 2013 and headquartered in Irvine, California, United States, the company offers 406 products in their lineup. Note: California Gold Nutrition has 6 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.