How does this Extra Strength 1,000 IU liquid compare to regular strength liquid vitamin D-3?

NOW Regular Strength Liquid Vitamin D-3 provides 100 IU per drop, which is designed for smaller, incremental dosing. This Extra Strength version provides 1,000 IU per single drop—ten times the concentration. That means adults can achieve their full daily target with just one tiny drop instead of taking ten separate drops, making it far more convenient and cost-effective.

Can I take this drop directly on my tongue, or should I mix it with food?

You can easily place 1 drop directly on your tongue or onto a spoon. Because the oil carrier is virtually tasteless and odorless, it goes down smoothly without any bitter aftertaste. Alternatively, you can drop it directly into a spoonful of yogurt, applesauce, or a morning smoothie. Avoid dropping it into boiling liquids like hot coffee or tea, as excessive heat can degrade the vitamin D molecule.

Will taking a single drop break intermittent fasting?

No. A single drop (0.04 mL) contains less than 1 calorie and zero sugars or proteins, meaning it will not cause an insulin spike or kick your body out of a fasted state. However, because Vitamin D is fat-soluble and absorbs significantly better when taken with mealtime fats, taking your drop with your first meal after your fasting window provides the greatest absorption benefit.

Why is this formula labeled "For adults only" and not for infants?

The American Academy of Pediatrics recommends 400 IU of daily vitamin D for infants. Because this extra strength product delivers 1,000 IU in a single drop, an infant or small child could easily receive more than their recommended daily threshold. For babies and young children, pediatricians recommend lower-concentration drops specifically formulated for pediatric dosing.

How long will this 2-ounce bottle last if I take it every day?

At the recommended adult serving of 1 drop per day, this bottle contains approximately 750 servings. That gives a single adult more than two full years of daily supplementation from one bottle, offering extraordinary economic value compared to short-supply softgels or gummies.

EXTRA STRENGTH LIQUID VITAMIN D-3 - 1 FL OZ

by NOW FOODS

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UPC: 733739003713: # N0371

NOW Foods Extra Strength Liquid Vitamin D-3 (1,000 IU per Drop, 2 fl oz)

Product Summary & Quick Specs Snapshot

NOW Foods Extra Strength Liquid Vitamin D-3 delivers 1,000 IU (25 mcg) of bioactive cholecalciferol in just one single drop. Suspended in a clean base of medium-chain triglyceride (MCT) oil and safflower oil, this concentrated liquid formula bypasses hard-to-swallow pills and synthetic fillers. It provides essential daily support to help your body absorb calcium, maintain dense bones, support strong muscle function, and reinforce natural immune defenses year-round [1, 2].

Quick Specs Snapshot

✓Active Form & Potency: 25 mcg (1,000 IU) of bioidentical Vitamin D-3 (as cholecalciferol from natural lanolin) in every single drop (approx. 0.04 mL), delivering 125% of your Daily Value.
✓Primary Cellular Target: Intestinal calcium absorption pathways, skeletal bone matrix mineralization, muscle fiber receptors, and white blood cell immune signaling [2, 3].
✓Supply & Value Math: Approximately 750 drops per 2 fluid ounce bottle—giving you more than two full years of daily sunshine nutrition for just pennies per day.
✓Formulation Purity: Non-GMO, carried in pure coconut/palm MCT oil and safflower oil. Free of wheat, gluten, soy, milk, egg, fish, shellfish, tree nuts, and sesame.

Buyer's Guide & Vitamin D Form Comparison

Why the Form Matters: Liquid D-3 vs. Dry Tablets & D-2

Many generic big-box store vitamins use synthetic Vitamin D-2 (ergocalciferol), an inexpensive plant-derived form that human biology struggles to utilize effectively [1]. Clinical research proves that Vitamin D-3 (cholecalciferol) binds far more tightly to transport proteins in your blood, raising and sustaining active vitamin D levels nearly twice as well as D-2 [1]. Furthermore, standard dry chalky tablets require strong digestive acids to break down and often pass right through your digestive tract without dissolving. Because Vitamin D is fat-soluble, NOW dissolves this D-3 directly into liquid MCT and safflower oils, pre-packaging it for immediate assimilation without digestive struggle [4].

Is This Formula Right for You?

Ideal For Shoppers Who:

✓ Experience pill fatigue or have difficulty swallowing large capsules and want an easy single-drop liquid option.
✓ Want a pure, extra-strength formula delivering 1,000 IU per drop without artificial sweeteners, flavors, or chemical preservatives.
✓ Spend most of their day indoors, wear sunscreen regularly, or live in northern regions with limited sunshine during fall and winter months.

Consider Another Option If:

✗ You prefer pre-measured individual softgels for travel rather than counting liquid drops from a dropper bottle.
✗ You are searching for an infant or toddler supplement (this extra strength product is strictly intended for adult use due to its high concentration).
✗ You follow a 100% strict vegan lifestyle (this formula sources natural D-3 from ethically harvested sheep's wool lanolin; a lichen-based vegan D-3 would be preferred).

Risk-Free Assurance: Every purchase is backed by VitaNet®, LLC's unconditional 100% money-back guarantee—even on opened bottles, with return shipping covered—so you can evaluate digestive comfort and personal fit completely risk-free.

How Vitamin D-3 Works in Your Body

Think of Vitamin D-3 as a biological master key. Even though it is called a vitamin, it acts like a potent regulatory hormone once inside your system. When you take a drop of cholecalciferol (chemical formula C₂₇H₄₄O), your body puts it through a precise two-step activation process to unlock vital cell functions [1, 2]:

1. The Liver Fuel Tank: After absorption through your digestive lining, cholecalciferol travels directly to your liver. An enzyme called 25-hydroxylase attaches a small oxygen-hydrogen tag to create calcidiol, known scientifically as 25-hydroxyvitamin D or 25(OH)D [2]. This is your body's circulating storage reserve—the exact biomarker your doctor checks during a routine blood test.

2. Kidney & Cellular Activation: When your tissues need active support, a second enzyme (1-alpha-hydroxylase) in your kidneys and immune cells converts calcidiol into calcitriol, or 1,25-dihydroxyvitamin D [1,25(OH)₂D₃] [2]. This fully active hormone binds directly to Vitamin D Receptors (VDR) inside your cell nuclei to turn on protective genes.

3. Intestinal Calcium Escort: Without active Vitamin D, your digestive tract absorbs only 10% to 15% of the calcium you consume from foods [2, 5]. Calcitriol triggers your intestinal cells to build specialized transport channels (TRPV6) and escort proteins (Calbindin). These microscopic escorts grab calcium ions (Ca²⁺) and phosphorus from your digested food and transport them into your bloodstream, boosting mineral absorption up to 30% to 40% to reinforce bone matrix density and tooth enamel [2, 5].

4. White Blood Cell Defense Signaling: Immune cells—including macrophages, T-cells, and B-cells—contain their own Vitamin D Receptors. Activated Vitamin D stimulates these cells to produce protective antimicrobial peptides, such as cathelicidin (LL-37), creating a frontline molecular shield against environmental immune challenges [3].

Daily Dosing, Timing & Synergy Protocol

Optimal Timing & Meal Pairing

Take 1 drop daily. Because Vitamin D is fat-soluble, it requires dietary lipids to stimulate bile acid secretion from your gallbladder [4]. While NOW suspends this formula in healthy MCT and safflower oil, taking your drop with a balanced meal that contains healthy dietary fats—such as eggs, avocado, olive oil, nut butter, or yogurt—promotes the formation of microscopic transport spheres called micelles, elevating absorption by up to 32% compared to taking supplements on an empty stomach [4].

Circadian Routine Strategy

Your body naturally produces vitamin D when your skin is exposed to bright midday sunshine. Because your internal biological clock associates vitamin D activity with daytime wakefulness, taking your drop in the morning with breakfast or during lunch supports your body's natural circadian rhythms without interfering with evening melatonin release.

Smart Synergies & Spacing Rules

✓Pairs Exceptionally Well With: Vitamin K-2 (MK-7) and Magnesium. While Vitamin D-3 increases calcium absorption into your blood, Vitamin K-2 activates osteocalcin to direct that calcium into your bones and teeth rather than arterial walls. Magnesium serves as an essential mineral cofactor that your liver and kidney enzymes must have to activate raw D-3 [2].
✗Spacing Rules: If you take prescription cholesterol-binding resins (such as cholestyramine), weight-loss fat-binders (such as orlistat), or high doses of bulk soluble fiber (such as psyllium husk), space them at least 2 hours away from your Vitamin D-3 drop to avoid trapping the fat-soluble vitamin in the digestive tract.

Timeline of Expectations

✓Week 1 (Rapid Assimilation): The pre-dissolved liquid drop absorbs effortlessly through the intestinal lining, replenishing circulating 25(OH)D reserves without stomach irritation or digestive upset [4].
✓Weeks 3–4 (Cellular Saturation): Blood levels of 25(OH)D climb toward optimal physiological ranges. Enhanced intestinal calcium transport supports neuromuscular ease and primes frontline white blood cell activity [2, 3].
✓Months 2–3+ (Long-Term Skeletal Defense): Circulating blood levels achieve steady-state balance, delivering consistent mineral nourishment to preserve bone mineral density, maintain tooth enamel, and sustain systemic vitality [1, 2].

Physical, Sensory & Clean Ingredient Profile

Delivery Format & Ease of Use

This product comes in a 2 fluid ounce (59 mL) amber bottle equipped with an integrated liquid dropper. Dispensing is simple and precise: invert the bottle slowly until a single drop forms. Because it is highly concentrated, you do not have to struggle with oversized softgels or chalky tablets. You can place the single drop directly on a spoon, mix it into morning yogurt, or blend it into your daily smoothie.

Natural Aroma, Taste & Color Notes

Because the D-3 is carried in pure, highly purified plant oils, the liquid is virtually odorless and tasteless. There is no medicinal bitterness, synthetic chemical aftertaste, or heavy oily film. In appearance, the liquid is crystal clear to very faintly pale golden. Because NOW never uses artificial colorings or dyes, minor variations between batches are completely normal and reflect natural plant oil harvests.

Other Ingredients Demystified

✓MCT Oil (Medium-Chain Triglycerides): Sourced from natural coconut and palm kernel oil. MCTs are healthy fatty acids that your digestive system breaks down rapidly without needing complex enzyme processing, acting as an optimal carrier to hold fat-soluble vitamin D in liquid stability.
✓Safflower Oil: A light, expeller-pressed culinary plant oil rich in unsaturated fatty acids that works alongside the MCT oil to ensure smooth, uniform drop delivery from first drop to last.

Storage & Bottle Stability

Store the bottle upright with the cap tightly sealed in a cool, dry place away from direct sunlight and heat (ideally between 60°F and 75°F). Refrigeration is not required, but keep the bottle away from high humidity areas like bathroom cabinets or hot stovetops. The dark amber glass bottle naturally protects the active vitamin D-3 molecules from light degradation.

Supplement Facts & NOW Brand Lab Testing Standards

Supplement Facts

Serving Size: 1 Drop (approx. 0.04 mL)

Servings Per Container: about 750

Description	Amount per Serving	% Daily Value
Vitamin D (as D3 Cholecalciferol) (from Lanolin)	25 mcg (1,000 IU)	125%

Other Ingredients: MCT Oil (medium-chain triglycerides) (from coconut/palm kernel oil) and Safflower Oil.

Allergen Statement: Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut, or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.

Caution: For adults only. Not for use in infants or children. Consult physician if pregnant/nursing, taking medication, or have a medical condition. Keep out of reach of children.

Potency Notice: This extra strength product has ten times the D-3 per drop (1,000 IU) than our regular strength product (100 IU). Made and quality tested in the USA with globally sourced ingredients. Family owned since 1968.

NOW Brand In-House Lab Testing & Contaminant Verification

Many bargain vitamins sold on discount online marketplaces cut corners by relying on middle brokers who perform minimal safety screening. Independent investigations frequently discover off-brand supplements that fail to meet label potency or carry hazardous environmental contaminants. In contrast, NOW Foods operates one of the most advanced private analytical testing facilities in North America, accredited under international standard ISO/IEC 17025:2017—the exact benchmark required of top forensic and pharmaceutical laboratories. Over 150 dedicated quality scientists conduct more than 19,000 comprehensive analytical tests every single month to enforce strict safety limits:

Reviewed and verified by the Nutritional Science Team at VitaNet®, LLC. Founded in 1995 as an independent, family-owned business in Hartville, Ohio, VitaNet® brings over 31 years of hands-on dietary supplement curation and human biochemistry expertise straight to your home. We partner directly with authorized distributors to supply 100% genuine, factory-sealed products kept in climate-controlled storage facilities.

Order with total confidence knowing every bottle is backed by VitaNet®, LLC's unconditional 100% money-back guarantee, including paid return shipping.