Lewis Labs Brewer's Yeast™, 12.35 oz (350 g) supplement bottle
Lewis Labs

Brewer's Yeast™, 12.35 oz (350 g)

What We Researched
40 active ingredients analyzed · 1 inactive ingredient decoded · 1 retailer compared · Last updated: Mar 2026
75
Product Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Calcium 20 mg 2%
Iron 1 mg 6%
Potassium 550 mg 10%
Thiamin 0.5 mg 40%
Riboflavin 1.5 mg 120%
Niacin 9.2 mg 60%
Vitamin B6 0.7 mg 50%
Folate 500 mcg 120%
Biotin 4.6 mcg 15%
Pantothenic Acid 2.5 mg 50%
Amino Acid Content in each Serving
Alanine 725 mg
Arginine 500 mg
Aspartic Acid 1100 mg
Cystine 150 mg
Glutamic Acid 2125 mg
Glycine 475 mg
Histidine 250 mg
Isoleucine 500 mg
Leucine 775 mg
Lysine 825 mg
Methionine 150 mg
Phenylalanine 475 mg
Proline 450 mg
Serine 550 mg
Threonine 525 mg
Tryptophan 150 mg
Tyrosine 350 mg
Valine 575 mg
Bioavailability Very Good

Absorption Rating

  • Calcium Good
  • Iron Fair
  • Potassium Good
  • Thiamin Good
  • Riboflavin Good
  • Niacin Good
  • Vitamin B6 Fair
  • Folate Fair
  • Biotin Good
  • Pantothenic Acid Good
  • Amino Acid Good
  • Alanine Fair
  • Arginine Good
  • Aspartic Acid Fair
  • Cystine Fair
  • Glutamic Acid Fair
  • Glycine Good
  • Histidine Good
  • Isoleucine Good
  • Leucine Good
  • Lysine Good
  • Methionine Good
  • Phenylalanine Fair
  • Proline Fair
  • Serine Fair
  • Threonine Good
  • Tryptophan Good
  • Tyrosine Good
  • Valine Good
Other Ingredients Excellent

Fillers & Additives

  • Brewer's yeast (inactive yeast)
Efficacy Poor

Dosage Analysis

  • Calcium 20 mg Under-dosed
  • Iron 1 mg Under-dosed
  • Potassium 550 mg Under-dosed
  • Thiamin 0.5 mg Under-dosed
  • Riboflavin 1.5 mg Effective
  • Niacin 9.2 mg Under-dosed
  • Vitamin B6 0.7 mg Under-dosed
  • Folate 500 mcg Effective
  • Biotin 4.6 mcg Under-dosed
  • Pantothenic Acid 2.5 mg Under-dosed
  • Arginine 500 mg Under-dosed
  • Aspartic Acid 1100 mg Under-dosed
  • Glutamic Acid 2125 mg Effective
  • Glycine 475 mg Under-dosed
  • Histidine 250 mg Under-dosed
  • Isoleucine 500 mg High
  • Leucine 775 mg Under-dosed
  • Lysine 825 mg Under-dosed
  • Methionine 150 mg Under-dosed
  • Phenylalanine 475 mg Under-dosed
  • Proline 450 mg Under-dosed
  • Serine 550 mg Effective
  • Tryptophan 150 mg Under-dosed
  • Tyrosine 350 mg Under-dosed
  • Valine 575 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Calories 100
Total Fat 1.2 g 2%
Saturated Fats 0.2 g 1%
Trans Fat 0 g
Cholesterol 0 mg 0%
Sodium 25 mg 1%
Total Carbohydrate 10 g 4%
Dietary Fiber 5 g 18%
Total Sugars 0 g
Includes 0 g Added Sugars
Protein 12 g 24%
Calcium 20 mg 2%
Iron 1 mg 6%
Potassium 550 mg 10%
Thiamin 0.5 mg 40%
Riboflavin 1.5 mg 120%
Niacin 9.2 mg 60%
Vitamin B6 0.7 mg 50%
Folate 500 mcg 120%
Biotin 4.6 mcg 15%
Pantothenic Acid 2.5 mg 50%
Amino Acid Content in each Serving
Alanine 725 mg
Arginine 500 mg
Aspartic Acid 1100 mg
Cystine 150 mg
Glutamic Acid 2125 mg
Glycine 475 mg
Histidine 250 mg
Isoleucine 500 mg
Leucine 775 mg
Lysine 825 mg
Methionine 150 mg
Phenylalanine 475 mg
Proline 450 mg
Serine 550 mg
Threonine 525 mg
Tryptophan 150 mg
Tyrosine 350 mg
Valine 575 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$32$31$30$29$28 Mar 12 $30.00
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
Lewis Labs

Founded 1973 · Southfields, NY, USA · 3 products · lewislabs.com/

Transparency

1 claim
Third Party Testing Claim — Claimed Source
Related Supplements
Frequently Asked Questions
Is Lewis Labs Brewer's Yeast™, 12.35 oz (350 g) a good supplement?

Lewis Labs Brewer's Yeast™, 12.35 oz (350 g) received a product quality score of 75/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 40 active ingredients with 14 servings per container. Of the 1 inactive ingredients, 0 are rated safe and 0 are flagged for review.

What are the ingredients in Lewis Labs Brewer's Yeast™, 12.35 oz (350 g)?

Lewis Labs Brewer's Yeast™, 12.35 oz (350 g) contains 40 active ingredients: Calories (100), Total Fat (1.2 g), Saturated Fats (0.2 g), Trans Fat (0 g), Cholesterol (0 mg), Sodium (25 mg), and 34 more. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Lewis Labs Brewer's Yeast™, 12.35 oz (350 g) safe to take?

Lewis Labs Brewer's Yeast™, 12.35 oz (350 g) 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.

Scan Any Supplement Instantly

Download GoodSupp to scan barcodes, check ingredient safety, and find the best supplements for your needs.

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.