NOW Foods B-100 S-R (Sustained Release) – High-Potency Vitamin B Complex (100 Tablets)
Looking for lasting cellular vitality without the rapid spike-and-crash of standard vitamin capsules? NOW Foods B-100 Sustained Release (S-R) delivers a complete 100 mg spectrum of vital B-complex vitamins formulated into an extended-release micro-matrix tablet. Unlike standard immediate-release capsules that dump nutrients into your digestive tract all at once, this specialized sustained-release formulation dissolves gradually over hours. This steady rate allows your digestive tract to continuously absorb and utilize each water-soluble coenzyme.
Quick Buying Summary: Every single tablet provides 100 mg of core B vitamins (Thiamin B-1, Riboflavin B-2, Niacin B-3, Pyridoxine B-6, and Pantothenic Acid B-5), paired with essential co-factors including 400 mcg of Folic Acid (680 mcg DFE), 100 mcg of Vitamin B-12, Biotin, Choline, Inositol, and PABA. Curated and stocked by VitaNet®, LLC—an independent, family-owned natural health retailer serving customers online since 1995 with an unconditional 100% money-back guarantee[cite: 1].
✓Steady Day-Long Absorption: Sustained-release delivery avoids rapid urinary loss of water-soluble nutrients.
✓Nervous System & Cellular Energy Support: Coenzymes support ATP energy production and nerve tissue resilience.
✓Cardiovascular Protection: Contains Folate, B-6, and B-12 to promote healthy homocysteine metabolism.
✓Non-Flushing Formulation: Features Niacinamide (Vitamin B-3) to avoid skin redness and hot flushes.
Why Choose B-100 Sustained Release Over Standard B-Complex?
B vitamins are fundamentally water-soluble. Your body uses what it can immediately process and flushes excess amounts out through your kidneys within 90 to 120 minutes. When taking a high-potency 100 mg non-sustained capsule, your intestinal transport carriers (such as sodium-dependent multivitamin transporters) quickly become saturated. Most of that potency ends up directly in your toilet as bright neon urine before your cells have a chance to absorb it.
The Sustained-Release Advantage: NOW Foods B-100 S-R uses a slowly hydrating cellulose plant matrix. When the tablet encounters digestive fluids in your stomach and upper small intestine, it forms an active, gentle gel barrier. The B vitamins slowly disperse into your bloodstream over several hours.
Feature / Metric
Standard B-100 Immediate Release
NOW Foods B-100 S.R. (Tablets)
Delivery Window
Dumps entire dose in 15–30 minutes
Gradual release over 6–8 hours
Intestinal Absorption
High loss due to early receptor saturation
Continuous cellular uptake all day
Digestive Tolerance
Can trigger mild nausea on empty stomachs
Gentler on gastric linings
Energy Sensation
Brief initial boost followed by mid-day dip
Consistent physical and cognitive stamina
NOW Foods Quality: ISO 17025 Testing & Strict Contaminant Standards
When buying high-potency nutritional supplements, purity and label accuracy are critical health factors. Many discount supplement brands rely solely on supplier paperwork without verifying contents. NOW Foods operates two advanced testing complexes in Bloomingdale, Illinois, and Sparks, Nevada, performing over 19,000 analytical tests and assays each month across incoming raw materials and finished lots.
Their analytical testing facilities maintain ISO/IEC 17025:2017 accreditation through the American Association for Laboratory Accreditation (A2LA). This distinction confirms that NOW's testing procedures meet the exact laboratory competencies required by university, clinical, and regulatory laboratories.
Heavy Metal Clearance (ICP-MS)
NOW screens every batch for Lead, Mercury, Cadmium, and Arsenic down to parts-per-billion (ppb) thresholds using Inductively Coupled Plasma Mass Spectrometry. Finished batches adhere to strict USP specifications and stringent California Proposition 65 safety levels.
Potency & Identification (HPLC & FTIR)
Using High-Performance Liquid Chromatography (HPLC) and Fourier-Transform Infrared Spectroscopy (FTIR), laboratory scientists confirm the true molecular identity and exact 100 mg potency of every B vitamin, ensuring zero degradation or label deception.
Microbiological & Allergen Screening
Automated PCR diagnostics verify complete absence of pathogens, including Salmonella, Escherichia coli, Listeria, and Staphylococcus, alongside rigorous testing for cross-contamination of gluten, dairy, nuts, and soy.
Other Ingredients: Hypromellose (cellulose), Microcrystalline Cellulose, Stearic Acid (vegetable source), Vegetarian Coating, and Silicon Dioxide.
Allergen & Manufacturing Declarations: Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut, or sesame ingredients. Produced in an NPA A-rated GMP facility that processes other ingredients containing these allergens. Certified Vegan, Vegetarian, Non-GMO, and Kosher.
In keeping with responsible health guidance, here are key scientific facts, safety cautions, and potential drug/test interactions you should review before starting this supplement:
Important: Biotin & Medical Blood Tests
The FDA has issued public safety communications cautioning that dietary biotin (Vitamin B-7) can significantly interfere with laboratory immunoassay blood tests. This includes tests for troponin (a critical heart attack biomarker) and thyroid panels (TSH, Free T3/T4). Clinical recommendation: Inform your healthcare provider and pause taking this supplement 48 to 72 hours prior to scheduled blood draws.
Harmless Bright Yellow Urine
Do not be alarmed if your urine turns bright neon yellow. This normal occurrence is known as flavinuria, caused by the body naturally clearing Riboflavin (Vitamin B-2). Its chemical structure acts as a natural yellow fluorophore. It is a harmless sign that your system is well-saturated.
Non-Flushing Niacinamide Form
Standard nicotinic acid can trigger cutaneous prostaglandin release, causing uncomfortable prickly heat, redness, and itching known as the "niacin flush." NOW B-100 S-R utilizes pure Niacinamide, which delivers identical coenzyme precursors (NAD+/NADH) without inducing vascular flushing.
Who Should Opt for a Different Form?
Individuals diagnosed with pernicious anemia or significant gastrointestinal malabsorption (such as post-bariatric surgery or lacking intrinsic factor) typically require high-dose sublingual methylcobalamin or intramuscular injections rather than slow-release swallowing tablets.
How to Take NOW B-100 S-R for Optimal Cellular Absorption
For optimal results and stomach comfort, follow these straightforward tips:
Take 1 Tablet Daily with Food: Taking your tablet alongside breakfast or lunch improves the dissolution of the vegetarian cellulose matrix and enhances nutrient assimilation.
Take Earlier in the Day: Because B-complex coenzymes directly support mitochondrial ATP cellular energy production, taking your tablet in the morning or early afternoon helps fuel your day without disrupting your natural sleep cycle.
Swallow Whole – Do Not Crush: To preserve the sustained-release mechanism, swallow the tablet whole with a full glass of water. Crushing, chewing, or halving the tablet breaks the micro-matrix and releases the entire 100 mg dose at once.
Stay Hydrated: Drinking adequate water throughout the day supports proper kidney clearance of unneeded water-soluble vitamins.
Direct Sourcing from VitaNet, LLC: Trusted Service Since 1995
Purchasing vitamins online should never feel like a gamble with unverified third-party storefronts. At VitaNet®, LLC, we are an independent, family-owned discount wellness retailer based in Hartville, Ohio, serving customers nationwide for over 31 years[cite: 1].
The VitaNet® Customer Assurance:
✓100% Unconditional Money-Back Guarantee: We stand behind every product we ship. If you are unsatisfied for any reason, we refund your order and even pay the return shipping costs—even on opened bottles[cite: 1].
✓Factory-Direct Freshness: Products are sourced directly from NOW Foods' state-of-the-art warehouses and stored in climate-controlled conditions to ensure maximum potency until the expiration date.
✓A+ Better Business Bureau Accreditation: Maintained through decades of transparent, customer-first service and dependable product support[cite: 1].
✓Real Human Support: Contact our Ohio team directly at (330) 877-8786 or visit our physical storefront at 887 Edison Street Northwest, Hartville, Ohio 44632[cite: 1].
Frequently Asked Questions (FAQ)
What is the primary difference between NOW B-100 Sustained Release and regular B-100 capsules?
Standard B-100 vegetable capsules dissolve quickly in your stomach within 15 to 30 minutes, releasing a large dose all at once. Because B vitamins are water-soluble, your body can only process a small portion at a time, excreting the rest quickly. NOW B-100 Sustained Release (S-R) tablets use a slowly hydrating cellulose matrix that delivers nutrients steadily over 6 to 8 hours. This prolonged release keeps vitamin levels steady in your system without sudden spikes.
Why does my urine turn bright neon yellow after taking this tablet?
This bright neon color is completely normal and harmless. It is caused by Riboflavin (Vitamin B-2), a natural yellow compound. As your body absorbs what it needs throughout the day, excess riboflavin safely clears through your kidneys, turning your urine a bright yellow hue.
Does NOW B-100 Sustained Release cause the prickly "niacin flush"?
No. NOW formulates this supplement with 100 mg of Niacinamide rather than nicotinic acid. Niacinamide provides full Vitamin B-3 coenzyme benefits without stimulating prostaglandin receptors that cause temporary facial redness, itching, or skin warming.
How does NOW Foods test B-100 S-R tablets for contaminants and heavy metals?
NOW conducts over 19,000 analytical tests per month across its in-house, ISO/IEC 17025 accredited laboratories. Every batch undergoes heavy metal screening (Lead, Arsenic, Cadmium, Mercury) via Inductively Coupled Plasma Mass Spectrometry (ICP-MS), identity and potency verification through High-Performance Liquid Chromatography (HPLC), and pathogen testing using automated PCR.
Can the biotin in this formula interfere with blood tests?
Yes. Dietary Biotin (Vitamin B-7) can interfere with diagnostic immunoassay tests, including troponin cardiac evaluations and thyroid function panels. Healthcare professionals recommend pausing high-potency B-complex vitamins 48 to 72 hours before planned laboratory blood testing.
Is this formula vegan-friendly and free from common allergens?
Yes. NOW Foods B-100 Sustained Release tablets are certified Vegan and Vegetarian, Non-GMO, and Kosher. They are manufactured without wheat, gluten, soy, milk, egg, fish, shellfish, tree nuts, or sesame ingredients in an NPA A-rated GMP-certified facility.
What is VitaNet's return policy if I am not completely satisfied?
VitaNet®, LLC provides an unconditional 100% money-back guarantee on all products[cite: 1]. If you are not completely satisfied with your order, VitaNet refunds your purchase and pays the return shipping costs—even on opened bottles[cite: 1].
Scientific References & Quality Citations
National Institutes of Health (NIH) Office of Dietary Supplements: Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, and Vitamin B12 Health Professional Fact Sheets. Available at: ods.od.nih.gov.
U.S. Food and Drug Administration (FDA) Safety Communication: Biotin May Interfere with Lab Tests. Safety Alerts for Human Medical Products.
Kennedy, D. O. (2016). B Vitamins and the Brain: Mechanisms, Dose and Efficacy—A Review. Nutrients, 8(2), 68. doi:10.3390/nu8020068.
International Organization for Standardization (ISO): ISO/IEC 17025:2017 – General requirements for the competence of testing and calibration laboratories.
United States Pharmacopeia (USP): General Chapter <2232> Dietary Supplement Elemental Contaminants & Chapter <2040> Disintegration and Dissolution of Dietary Supplements.
