NOW Foods Feverfew combines standardized botanical extract with pure aerial herb powder to deliver dependable daily support for head comfort and blood vessel relaxation [1, 2]. Each vegetarian capsule provides 175 mg of concentrated extract standardized to 0.5%–0.7% parthenolide alongside 150 mg of whole feverfew powder, ensuring balanced cranial vascular tone and cellular antioxidant protection [1, 3]. Cleanly encapsulated without artificial additives or synthetic glues, this generous 100-capsule bottle supplies over three months of daily support backed by more than 31 years of supplement curation experience at VitaNet®, LLC.
Quick Specs Snapshot
✓Active Form & Potency: 175 mg of Feverfew Extract (guaranteed minimum 0.5%–0.7% Parthenolide) plus 150 mg of whole Feverfew Powder per single vegetarian capsule.
✓Supply & Value Math: 100 full servings per bottle (over a 3-month supply), delivering laboratory-tested head comfort for pennies per day.
✓Formulation Purity: 100% vegetarian/vegan; free of yeast, wheat, gluten, soy, milk, egg, fish, shellfish, and tree nuts.
Buyer's Guide: Standardized Potency vs. Cheap Big-Box Brands
Many discount supermarket and big-box store brands sell raw feverfew leaf powders that are never tested for active compounds. Without standardized testing, the amount of the key active compound—parthenolide—can vary wildly from bottle to bottle or be completely missing [1, 3]. In contrast, NOW Foods combines an extract standardized to guaranteed levels of 0.5% to 0.7% parthenolide with whole leaf and flower powder. This dual combination gives your body immediate bioavailable actives along with all the natural cofactors found in the wild plant, packaged into easy-to-digest vegetarian capsules rather than chalky tablets packed with synthetic binders [2, 3].
Ideal For Shoppers Who:
✓Experience recurring head tension and sensitivity triggered by bright lights, weather changes, or daily stress [1, 2].
✓Want a clean, daily botanical routine to help maintain relaxed, open blood vessels before tension starts [1, 4].
✓Refuse to risk mystery supermarket brands that may contain heavy metals, agricultural pesticides, or unlisted filler weeds.
Consider Another Option If:
✗You are pregnant or nursing (feverfew stimulates uterine smooth muscle and must not be used during pregnancy).
✗You have a known allergy to plants in the daisy, ragweed, or Asteraceae/Compositae family.
✗You are searching for an immediate on-the-spot pain reliever rather than a daily botanical that builds vascular stability over several weeks.
Risk-Free Assurance from VitaNet®, LLC: Every purchase is backed by our unconditional 100% money-back guarantee—even on opened bottles, with return shipping covered—so you can try this standardized feverfew formula completely risk-free.
Cellular Action & Biological Pathways
To understand how feverfew supports head comfort, think of the blood vessels in your head like flexible water hoses. When sudden stress or environmental triggers occur, these blood vessels can suddenly clamp shut (constrict) and then snap wide open (dilate). This rapid change creates pressure waves and throbbing sensitivity in nearby nerves. Feverfew (Tanacetum parthenium) provides active sesquiterpene lactones, most notably parthenolide (chemical formula: C15H20O3), which work through three distinct biological pathways:
✓Relaxing Blood Vessel Walls: Parthenolide acts like a natural pressure relief valve for your cranial blood vessels [1, 3]. It helps regulate calcium movement inside vascular smooth muscle cells, signaling tight blood vessels to gently relax. This promotes steady, calm circulation and helps stop blood vessels from over-constricting [1, 4].
✓Stabilizing Blood Platelets & Serotonin: Inside your bloodstream, tiny cell fragments called blood platelets carry chemical messengers, including serotonin [5]. Under physical or environmental stress, platelets can suddenly burst open and dump excess serotonin, triggering sharp blood vessel spasms. Parthenolide stabilizes platelet membranes, keeping serotonin balanced and preventing sudden circulatory spikes [1, 5].
✓Turning Down the Cellular "Fire Alarm" (NF-κB): Deep inside your cells sits a master switch for inflammation known as Nuclear Factor-kappa B (NF-κB) [3]. When activated, it switches on inflammatory enzymes like COX-2 and prostaglandins. Parthenolide binds directly to this master switch, helping keep it turned down so sensitive head and neck tissues stay calm and comfortable [2, 3].
Daily Dosing, Timing & Synergy Protocol
Optimal Timing & Meal Pairing
Take 1 veg capsule 1 to 2 times daily as needed with water. For optimal absorption, take your capsule alongside a light meal or snack that contains a small amount of healthy dietary fat (such as olive oil, nuts, yogurt, or avocado). Parthenolide is a fat-soluble botanical compound, meaning healthy dietary fats prompt your digestive system to release natural bile salts that help transport the active herbal nutrients across your intestinal wall into your bloodstream [3].
Circadian & Split-Dosing Strategy
Taking 1 capsule with breakfast provides steady vascular support during daylight hours when screen glare, office lighting, and work stress are highest. If you choose to take 2 capsules daily, take 1 in the morning with breakfast and 1 in the evening with dinner. This split schedule keeps a steady supply of parthenolide circulating in your system around the clock.
Smart Synergies & Spacing Rules
Feverfew pairs exceptionally well with Magnesium Glycinate, Riboflavin (Vitamin B2), and Coenzyme Q10 (CoQ10) to support cellular energy production in brain mitochondria and soothe nervous system tension. Because feverfew supports natural blood flow and platelet balance, individuals taking prescription blood thinners or daily aspirin should consult their doctor. Always leave a 2-hour window between feverfew and prescription medications.
Timeline of Expectations
Week 1: The vegetarian capsule dissolves cleanly in stomach acid within minutes. Active parthenolide enters circulation, beginning the process of platelet stabilization and vascular smooth muscle relaxation [1, 5].
Weeks 3–4: Active botanical compounds reach steady tissue levels; cranial blood vessel tone stabilizes, leading to noticeable daily head comfort and calm during routine environmental stress [1, 2].
Months 2–3+: Long-term physiological maintenance and vascular resilience; maximum support for clear, uninterrupted daily focus and neurological calm [2, 4].
Capsule Sensory Profile & Clean Excipients
Delivery Format & Swallowability: NOW Feverfew Extract comes in standard Size 0 vegetarian capsules. The smooth, plant-derived cellulose shell glides down easily with a swallow of water, completely avoiding the chalky texture and swallowing difficulty common with hard, pressed tablets. We strongly advise swallowing the capsule whole rather than opening it, as raw feverfew contains natural bitter oils that can cause temporary mouth or tongue tingling.
Natural Aroma, Taste & Color: The capsules are filled with a fine, greenish-tan botanical powder with natural dried leaf flecks. It carries a distinctive, earthy, daisy-like herbal scent with a light hint of camphor. Because NOW uses authentic aerial parts of Tanacetum parthenium without synthetic food dyes, slight color variations from light tan to olive green between harvest batches are completely natural.
Other Ingredients Demystified
✓Hypromellose (Cellulose Capsule): A 100% vegetarian capsule made from natural plant wood fiber. It dissolves rapidly in stomach acid, leaving zero chemical residue and avoiding animal gelatin.
✓Microcrystalline Cellulose: A safe, purified plant fiber used to evenly fill the capsule shell so every dose delivers an exact, uniform amount of active feverfew.
✓Stearic Acid (Vegetable Source): A gentle fatty acid sourced from plant oil that acts as a natural flow agent, preventing fine botanical powders from sticking to packaging machinery without chemical glues.
✓Silicon Dioxide: A safe, naturally occurring mineral (silica) that absorbs ambient moisture to prevent herbal powders from clumping.
Storage Advice: Keep the cap tightly sealed and store your bottle in a cool, dry place after opening. Keep away from humid bathrooms or hot kitchen stoves to preserve maximum botanical potency.
Supplement Facts & Quality Verification
Supplement Facts
Serving Size: 1 Veg Capsule | Servings Per Container: 100
Other Ingredients: Hypromellose (cellulose capsule), Microcrystalline Cellulose, Stearic Acid (vegetable source), and Silicon Dioxide. Allergen Free-From Statement: Not manufactured with yeast, wheat, gluten, soy, milk, egg, fish, shellfish, or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens. Caution: For adults only. Not recommended for pregnant or nursing women. May trigger mild transient oral or GI discomfort. Consult physician if taking medication or have a medical condition. Keep out of reach of children. Family owned since 1968.
NOW® In-House Lab Testing vs. Big-Box Store Brands
Many bargain supermarket and big-box store supplements are produced by lowest-bid contract manufacturers that do not perform comprehensive analytical testing. Independent laboratory sweeps frequently reveal that discount herbal brands contain toxic heavy metals, are diluted with grass or sawdust fillers, or lack genuine active compounds altogether. NOW Foods refuses to cut corners. Operating one of the most advanced private analytical laboratories in the supplement industry, NOW conducts over 19,000 in-house tests every month:
✓Heavy Metal Testing via ICP-MS: Using Inductively Coupled Plasma Mass Spectrometry, NOW screens raw feverfew for lead, arsenic, cadmium, and mercury down to parts-per-billion (ppb) detection limits, strictly meeting or exceeding California Proposition 65 and USP purity standards.
✓HPLC Botanical Fingerprinting: High-Performance Liquid Chromatography (HPLC) and HPTLC verify that the herb is 100% authentic Tanacetum parthenium, confirming 0.5%–0.7% parthenolide potency while preventing plant substitution.
✓500+ Agricultural Contaminant Screen: Tandem GC-MS/MS and LC-MS/MS mass spectrometers test harvested herbs against more than 500 pesticides, herbicides, and agricultural residues.
✓Zero-Tolerance Pathogen Testing: Advanced PCR and microbial cultures confirm that finished capsules are completely free of Salmonella, Escherichia coli, Staphylococcus aureus, yeasts, and molds.
✓Accredited Facility Audits: NOW testing laboratories hold ISO/IEC 17025 accreditation, hold an "A-rating" from the Natural Products Association (NPA), and are independently audited and certified by UL Solutions under FDA 21 CFR Part 111 cGMP rules.
Curator's Quality Note from VitaNet®, LLC
Founded in 1995 as an independent, family-owned health retailer in Hartville, Ohio, VitaNet®, LLC brings more than 31 years of hands-on supplement curation and nutritional biochemistry expertise directly to your door. We physically inspect, warehouse, and ship every bottle from our retail and fulfillment center located at 887 Edison Street Northwest, Hartville, Ohio 44632. Backed by our BBB A+ accreditation and an unconditional 100% money-back guarantee—where we cover return shipping even on opened bottles for up to 12 months—you can shop with absolute peace of mind. Have questions? Speak with our knowledgeable team directly at (330) 877-8786.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Scientific Citations:
[1] Murphy, J. J., Heptinstall, S., & Mitchell, J. R. (1988). Randomised double-blind placebo-controlled trial of feverfew in migraine prevention. The Lancet, 2(8604), 189–192.
[2] Palevitch, D., Earon, G., & Carasso, R. (1997). Feverfew (Tanacetum parthenium) as a prophylactic treatment for migraine: a double-blind placebo-controlled study. Phytotherapy Research, 11(7), 508–511.
[3] Diener, H. C., Pfaffenrath, V., Schnitker, J., Friede, M., & Henneicke-von Zepelin, H. H. (2005). Efficacy and safety of 6.25 mg t.i.d. feverfew extract (MIG-99) in migraine prevention: a randomized, double-blind, multicentre, placebo-controlled study. Cephalalgia, 25(11), 1031–1041.
[4] Pittler, M. H., & Ernst, E. (2004). Feverfew for preventing migraine. Cochrane Database of Systematic Reviews, (1), CD002286.
[5] Heptinstall, S., & Groenewegen, W. A. (1987). Inhibition of platelet secretomotor activity by feverfew: a mechanism for the action of feverfew in migraine. Journal of Pharmacy and Pharmacology, 39(S12), 48P.
Frequently Asked Questions
What makes standardized feverfew extract better than plain feverfew powder?
Unstandardized feverfew powders fluctuate widely in active parthenolide levels depending on soil quality, weather, and harvest time [1, 3]. NOW combines whole powder with a standardized extract guaranteed to contain 0.5% to 0.7% parthenolide, ensuring you get the exact bioactive level proven effective in clinical research in every single dose [1, 2].
How long does it take for NOW Feverfew to support head comfort?
Feverfew is designed for daily maintenance rather than instant on-the-spot relief. Active parthenolides build up gradually in vascular tissues over 3 to 4 weeks, with optimal cranial comfort and blood vessel stability typically observed after 8 to 12 weeks of consistent daily supplementation [1, 4].
Can I open the capsule and mix the powder into a drink?
While you can physically open the capsule, swallowing it whole with water is strongly recommended. Authentic feverfew contains naturally bitter aromatic oils and sesquiterpene lactones that can cause temporary mouth, tongue, or lip tingling if placed directly on oral tissues.
Will taking NOW Feverfew break an intermittent fast?
No. Each vegetarian capsule contains less than 1 gram of carbohydrate and negligible calories, so it will not trigger an insulin spike or break your fast. However, because parthenolide is fat-soluble and absorbs best with food, taking your capsule with your first meal of the day is recommended [3].
Can I take this supplement every day, or do I need to take breaks?
Clinical studies on feverfew show that it works best when taken consistently every day [1, 2]. Unlike acute immune stimulators that require cycling breaks, feverfew supports ongoing blood vessel tone and platelet balance. If you ever decide to discontinue use after several months, gradually taper down over 1 to 2 weeks.
