If you are looking for pure, unadulterated whole-food nutrition without artificial fortifiers, NOW® Brewer's Yeast 10 Grain 650 mg provides an authentic source of naturally occurring B-complex vitamins, trace minerals, amino acids, and immune-supporting beta-glucans. Unlike powdered yeast that carries a sharp, notoriously bitter flavor, these compressed 10-grain (650 mg) tablets deliver genuine whole-food nourishment in an easy-to-swallow format.
Supplied by VitaNet, LLC—an independent, family-owned health retailer founded in 1995 with over 31 years of direct nutritional supplement experience[cite: 1]—this shelf-stable superfood is non-GMO, heat-inactivated, and screened for maximum purity.
Quick Product Takeaways:
✓ 100% Whole-Food Source: Contains naturally synthesized B-vitamins with zero synthetic additives, isolated chemicals, or artificial fortifiers.
✓ Completely Inactive: Heat-treated and dried Saccharomyces cerevisiae that cannot ferment, multiply, or cause gut yeast imbalances.
✓ Natural GTF Chromium: Supplies organically bound Glucose Tolerance Factor (GTF) chromium to aid everyday blood sugar regulation.
✓ Tested for Purity: Rigorously analyzed in ISO 17025-certified laboratories using ICP-MS to guarantee heavy metals remain below strict safety limits.
Brewer's Yeast vs. Nutritional Yeast: Understanding the Difference
While both nutritional yeast and brewer's yeast come from the single-celled microscopic fungus Saccharomyces cerevisiae, their growth environments, flavor profiles, and nutritional roles differ substantially:
Comparison Factor
NOW® Brewer's Yeast 10 Grain
Standard Nutritional Yeast
Active Baker's Yeast
Origin & Growth
Grown on germinated barley and wheat malt during beer brewing.
Cultivated primarily on enriched cane or beet molasses.
Cultivated on nutrient broth for baking fermentation.
Vitamin Status
100% Unfortified: All B-vitamins are produced naturally by the organism.
Frequently fortified with synthetic B-complex (cyanocobalamin, folic acid).
Naturally rich in bioactive Glucose Tolerance Factor (GTF) chromium.
Very low natural chromium unless artificially supplemented.
Negligible active trace mineral complexes.
Viability / Action
Heat-inactivated; will not leaven, produce gas, or colonize gut tissue.
Heat-inactivated; inert cell biomass.
Live culture: Ferments sugar, produces carbon dioxide, unsafe as a raw supplement.
Taste Profile
Naturally bitter and earthy; bypassed seamlessly in tablet form.
Savory, cheesy, and nutty flakes widely used on food.
Raw dough smell, unpalatable.
Scientific Note: Brewer's yeast remains the historical benchmark for natural chromium research because the cell wall matrix binds trivalent chromium into low-molecular-weight complexes, optimizing cellular absorption compared to standard inorganic salts (Mertz, W., Physiological Reviews, 1969).
Primary Health Benefits in Plain English
Rather than relying on industrial multivitamin capsules containing synthetic isolates, brewer's yeast provides micronutrients embedded in organic peptides and enzymes. Here is what that means for your everyday health:
1. Cellular Energy Without the Caffeine Crash
Brewer's yeast is naturally stocked with the full spectrum of non-B12 B-vitamins: Thiamin (B1), Riboflavin (B2), Niacin (B3), Pyridoxine (B6), Folate (B9), Biotin (B7), and Pantothenic Acid (B5). These micronutrients serve as mandatory enzymatic cofactors in the Krebs cycle, converting dietary carbohydrates, proteins, and dietary fats into usable ATP (cellular fuel) (National Institutes of Health Fact Sheets for Health Professionals: Thiamin & Riboflavin).
2. Healthy Blood Sugar Balance (GTF Chromium)
Chromium is an essential trace element that works closely with your body's natural insulin. Brewer's yeast contains Glucose Tolerance Factor (GTF) chromium, a specialized organic compound that helps insulin lock onto cell surface receptors, allowing blood glucose to pass smoothly out of the bloodstream and into muscular and hepatic cells for energy (Anderson, R.A., Diabetes & Metabolism, 2000).
3. Structural Nourishment for Skin, Hair, and Nails
Keratin is the structural protein responsible for resilient hair fibers, firm nails, and smooth dermal architecture. Brewer's yeast delivers naturally formed biotin alongside key sulfur-containing amino acids (such as methionine and cysteine) that fuel your body's endogenous keratin synthesis pathways.
4. Immune Defense from Beta-1,3/1,6-Glucans
The rigid cellular exterior of Saccharomyces cerevisiae consists of specialized structural carbohydrates known as beta-1,3/1,6-D-glucans. When digested, these compounds interact with Dectin-1 receptors located on intestinal macrophages in gut-associated lymphoid tissue (GALT), priming innate white blood cells to defend against environmental microbial challenges without triggering systemic inflammation (Brown, G.D. & Gordon, S., Nature, 2001).
Because yeast biomass absorbs minerals and environmental compounds directly from its agricultural growth medium, low-cost commodity yeast products can carry dangerous levels of agricultural chemical residues or heavy metals. NOW Foods operates one of the most advanced analytical testing facilities in the nutritional industry to eliminate this risk:
Over 31,000 Laboratory Tests Monthly: Conducted inside world-class, ISO/IEC 17025:2017 accredited quality control laboratories to verify ingredient identity, potency, and physical specifications across raw materials and finished lots.
ICP-MS Heavy Metal Screening: Using Inductively Coupled Plasma-Mass Spectrometry, NOW conducts over 11,000 annual elemental analyses. This ultra-sensitive instrument measures heavy metal contaminants—including Lead, Cadmium, Arsenic, and Mercury—down to parts-per-billion (ppb) concentrations, enforcing purity standards that routinely exceed FDA rules and California Proposition 65 safety thresholds.
Tandem Mass Spectrometry (GC-MS/MS & LC-MS/MS): Advanced liquid and gas chromatography screen raw barley and wheat yeast derivatives for hundreds of residual pesticides, mycotoxins, and organic chemical impurities.
Specialized Glyphosate Testing (IC-MS/MS): Ion chromatography paired with tandem mass spectrometry tests raw ingredients specifically for trace residues of glyphosate and its breakdown products at parts-per-billion levels.
Total Microbiological Pathogen Screening: Automated assays verify that every production batch is completely free from dangerous pathogens, including Escherichia coli, Salmonella species, and Staphylococcus aureus, while enforcing strict limits on total aerobic plate counts and molds.
cGMP Certified Facility: Fully certified through Intertek under strict Current Good Manufacturing Practices (21 CFR Part 111), providing audited assurance of physical batch consistency and cross-contamination prevention.
Crucial Safety Information, Drug Interactions & Contraindications
Because brewer's yeast is a biologically active whole-food substance, it carries specific medical contraindications that must be observed to ensure your safety:
Brewer's yeast contains significant amounts of tyramine, an amino acid derivative involved in blood pressure regulation. In healthy individuals, the enzyme monoamine oxidase-A (MAO-A) quickly metabolizes dietary tyramine in the gut. However, if you take antidepressant MAOI medications (such as phenelzine, tranylcypromine, isocarboxazid, or selegiline), tyramine is blocked from breaking down. This can cause circulating tyramine to build up, releasing norepinephrine and triggering a life-threatening, sudden elevation in blood pressure known as a hypertensive crisis (Blackwell, B., The Lancet, 1963; Gillman, P.K., Br J Psychiatry, 2011). Do not consume brewer's yeast if you take MAOIs.
2. Crohn's Disease & ASCA Immune Reactivity
Between 50% and 70% of patients diagnosed with Crohn's disease produce Anti-Saccharomyces cerevisiae Antibodies (ASCA). In these individuals, yeast cell wall mannans can trigger an exaggerated immune response across the intestinal lining, aggravating chronic bowel inflammation (Bossuyt, X., Clinical Chemistry, 2006). If you have Crohn's disease or active ulcerative colitis, avoid brewer's yeast supplements unless approved by your gastroenterologist.
3. Diabetes Medications & Hypoglycemia Risk
Because the natural GTF chromium in brewer's yeast enhances insulin receptor sensitivity, taking it alongside prescription hypoglycemic agents (such as metformin, glipizide, or injectable insulin) can cause your blood sugar to drop faster than expected. Monitor your blood glucose levels carefully and speak with your doctor before starting.
4. Gout & High Uric Acid Levels
Yeasts are concentrated cellular organisms that naturally contain high amounts of purines (nucleic acids). When purines break down in the body, they form uric acid. Individuals predisposed to gout or kidney stones should exercise caution, as heavy intake can precipitate joint discomfort (Clifford, A.J., Am J Clin Nutr, 1976).
5. Celiac Disease & Wheat Allergies
This product is cultivated on barley and wheat during the brewing process. It contains wheat and gluten. Individuals with celiac disease or true wheat allergies should not use this supplement.
Complete Ingredient Profile & Supplement Facts
Verified against official manufacturer specifications for NOW® Product #02410 (BREWERS YEAST 10 GR 650mg):
Supplement Facts
Serving Size: 3 Tablets
Servings Per Container: Approx. 66
Amount Per Serving
% Daily Value
Calories 5
Total Carbohydrate 1 g
<1%*
Protein 1 g
2%*
Brewer's Yeast (dried, inactive)
1.95 g (1,950 mg)
†
* Percent Daily Values are based on a 2,000 calorie diet.
† Daily Value not established.
Other Ingredients: Hydroxypropyl Cellulose, Stearic Acid (vegetable source), Croscarmellose Sodium, Magnesium Stearate (vegetable source), and Silicon Dioxide.
Allergen Notice: Contains wheat. Brewer's yeast is derived from barley and wheat. Not manufactured with soy, milk, egg, fish, shellfish, tree nut, or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Practical Dosage & Retail Insights (From 31+ Years of Supplement Experience)
At VitaNet, LLC, our direct customer work over more than three decades[cite: 1] reveals practical nuances that standard bottle labels overlook. Here is how to achieve the best results with 10-grain brewer's yeast tablets:
Start Low to Avoid Digestive Bloating: The manufacturer suggested use is 3 tablets, 3 times daily with food (9 tablets total = 5,850 mg yeast). However, if your gut microbiome is unaccustomed to whole yeast fibers and nucleic acids, taking 9 tablets on Day 1 can cause mild gas or abdominal rumbling. Retail tip: Start with 1 tablet with each main meal (3 tablets total per day) for the first 4 to 5 days, then gradually increase to the full label dosage as your digestive system adjusts.
Always Take with Water and Food: Because these are compressed whole-food tablets, swallowing them with a full 8-ounce glass of water alongside a meal promotes comfortable transit down the esophagus and speeds natural tablet breakdown in the stomach.
Consistency Beats Sporadic High Dosing: Whole-food water-soluble B-vitamins are continuously utilized and cleared by your body. Splitting your tablets across breakfast, lunch, and dinner delivers a steady nutritional supply rather than a single sudden spike.
100% Risk-Free Guarantee: When ordering through VitaNet, LLC, every purchase is protected by our family-owned 100% money-back guarantee—including prepaid return shipping even on opened items[cite: 1].
Frequently Asked Questions (FAQ)
What does "10 Grain" (10 GR) mean on this bottle?
"Grain" is a traditional apothecary unit of weight originating in early pharmacy formulations. Exactly 1 grain equals approximately 64.8 milligrams. Therefore, a 10-grain tablet contains roughly 650 milligrams of dried brewer's yeast.
Can NOW Brewer's Yeast cause a Candida infection or fungal overgrowth?
No. The yeast in this supplement is Saccharomyces cerevisiae that has been thoroughly dried and heat-inactivated. Because the cells are non-viable, they cannot reproduce, colonize the gut, or produce an active fungal infection. However, individuals with active, diagnosed yeast allergies or Crohn's disease should avoid it.
Does this product have synthetic Vitamin B12 added?
No. NOW Brewer's Yeast is completely unfortified. Saccharomyces cerevisiae does not naturally manufacture Vitamin B12. If you are following a strict vegan diet and need B12, you should take a separate Vitamin B12 (methylcobalamin) supplement alongside these tablets.
Why are tablets better than loose brewer's yeast powder?
Natural brewer's yeast retains a distinctly bitter, pungent taste inherited from brewing hops and barley. Many consumers find drinking powder mixed into water or juice unpleasant. The 650 mg tablets bypass your taste buds completely, offering the same whole-food benefits without the bitter taste.
Why is there a warning for people taking MAOI medications?
Brewer's yeast contains naturally high levels of tyramine. Monoamine oxidase inhibitor (MAOI) medications block the body's natural ability to degrade dietary tyramine. Combining the two can trigger dangerous, sudden spikes in blood pressure (hypertensive crisis). Anyone taking MAOI pharmaceuticals must avoid brewer's yeast.
