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Free Shipping on Orders $25+
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Subscribe & Save 10%
30-Day Money-Back Guarantee
150+ Premium Formulas
Free Shipping on Orders $25+
Same-Day Shipping
Subscribe & Save 10%
30-Day Money-Back Guarantee
150+ Premium Formulas
Free Shipping on Orders $25+
Same-Day Shipping
Subscribe & Save 10%
30-Day Money-Back Guarantee
150+ Premium Formulas
Windmill Vitamin D3 1000 IU Bone & Immune Support Tablets 100ct — view 1
Windmill Vitamin D3 1000 IU Bone & Immune Support Tablets 100ct — view 2
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Made in the USANon-GMOGluten-FreeNo Artificial ColorsNo Artificial Flavors

Windmill Vitamin D3 1000 IU Bone & Immune Support Tablets 100ct

Family owned & trusted since 1972

$8.99per unitSave $10.99+ Subscribe & Save 10%

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What Our Customers Are Saying

Reviews from verified customers about their experience shopping with us — our store and service, not this specific product.

5.0· 15 store reviews
Verified Buyer

Great product, great site, quick delivery and great prices!!!

Lorenzo G.1 month ago
Verified Buyer

The items from Moore Vitamins shipped so fast and the customer service was great. The vitamins are good quality and perfect for what I needed. I will be buying Moore again

Emily B.4 weeks ago
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The overall customer service was excellent, and the transaction was smooth from start to finish. Delivery was faster than I expected, which was a pleasant surprise.

Joy P.1 week ago
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I had a fantastic experience purchasing my vitamins from this online shop. The website was easy to navigate, making it simple to find exactly what I was looking for. The ordering process was quick and hassle-free, and the prices were great.

Emily B.4 weeks ago
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Everything was great with my last order. I will definitely be ordering again.

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Customer Product Reviews

5.0

Based on 1 review

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Jun 19, 2026
Emily B.Verified Buyer

"I had a fantastic experience purchasing my vitamins from this online shop.

The website was easy to navigate, making it simple to find exactly what I was looking for. The ordering process was quick and hassle-free, and the prices were great, especially with the coupons Moore Vitamins offers. The quality of the products has been excellent, and the overall shopping experience exceeded my expectations. Great value, fast service, and a user-friendly website—I’ll definitely be ordering from here again and would highly recommend it to others.

The Difference

Why You'll Love It

01

Bone & Joint

Supports healthy calcium absorption for strong bones and teeth.

02

Immune Defense

Helps maintain immune system function year-round.

03

Strength & Muscle

Promotes healthy muscle function and nervous system support.

04

Rest & Recovery

Supports a positive mood and overall well-being.

05

Vitamin D

Pure, concentrated D3 in convenient daily dosage.

06

Key Benefit

Ideal for those with limited sun exposure or dietary gaps.

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About This Product

Strengthen your foundation with Windmill's potent Vitamin D3 25 mcg (1,000 IU) — the essential nutrient your body needs every single day to support calcium absorption, bone health, and immune function.

  • Supports healthy calcium absorption for strong bones and teeth
  • Helps maintain immune system function year-round
  • Promotes healthy muscle function and nervous system support
  • Supports a positive mood and overall well-being
  • Pure, concentrated D3 in convenient daily dosage
  • Ideal for those with limited sun exposure or dietary gaps

Formulated by Windmill Health Products — a trusted American supplement brand for over 50 years, manufactured in an FDA-regulated, cGMP-certified facility. Each tablet delivers 25 mcg (1,000 IU) of Vitamin D3 as cholecalciferol plus 75 mg of calcium for enhanced bone support.

Non-GMO
Non-GMO
Gluten-Free
Gluten-Free
Made in the USA
No Artificial Colors
No Artificial Flavors
No Preservatives
Supplement Facts

What's Inside

Serving size: 1 Tablet

Vitamin D3 (as cholecalciferol)

25 mcg

125% Daily Value

Calcium (as dicalcium phosphate)

75 mg

6% Daily Value

Your Routine

How does Windmill Vitamin D3 1000 IU Bone & Immune Support Tablets 100ct work?

01

Take Daily

Take 1 tablet daily with food as a dietary supplement or as directed by a healthcare professional.

02

Absorb & Nourish

Premium ingredients absorb efficiently, delivering targeted nutrition where your body needs it most.

03

Feel the Difference

Most people notice improvements within 2–4 weeks of consistent daily use. Real results, not hype.

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How We Compare

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Frequently Asked Questions

Most people notice a difference from Windmill Vitamin D3 1000 IU Bone & Immune Support Tablets 100ct within 2–4 weeks of consistent daily use, with the timeline depending on which benefit you're tracking. Supplements work gradually because nutrients accumulate to therapeutic levels over time, and biological systems like immune response, sleep regulation, and energy metabolism adapt to the new baseline rather than flipping a switch. For calcium absorption, bone health, and immune function, healthy calcium absorption for strong bones and teeth, the change is usually subtle at first — better sleep quality, more sustained energy through the afternoon, or reduced bloating — before it becomes obvious. Take Windmill Vitamin D3 1000 IU Bone & Immune Support Tablets 100ct at the same time each day to build a consistent absorption pattern, and track how you feel weekly rather than daily. People who were more depleted to start often notice a difference faster than people who had adequate baseline levels. If you have a diagnosed condition or take prescription medication, ask your healthcare provider about expected timelines for your specific situation before evaluating progress.

The label directions for Windmill Vitamin D3 1000 IU Bone & Immune Support Tablets 100ct are: Take 1 tablet daily with food as a dietary supplement or as directed by a healthcare professional. Beyond the label, consistency matters more than perfect timing — take it at the same time each day so levels in your system stay steady, and anchor the habit to something you already do, like breakfast or brushing your teeth. If the label doesn't specify food, taking supplements with a meal is a reasonable default: fat-soluble nutrients absorb better with dietary fat, and food buffers the stomach upset some people get from capsules taken empty. Don't double up after a missed day — just resume the normal dose. Store the bottle in a cool, dry place away from direct sunlight, not in a steamy bathroom cabinet. If you take prescription medication, are pregnant or nursing, or have a medical condition, check with your healthcare provider about timing and fit before starting.

Windmill Vitamin D3 1000 IU Bone & Immune Support Tablets 100ct is manufactured in cGMP-certified, FDA-regulated facilities in the USA. The FDA's current Good Manufacturing Practice rules for dietary supplements require manufacturers to test every batch for ingredient identity, strength, purity, and composition — confirming the bottle contains exactly what the label claims, in the stated dose, with no contaminants above safety thresholds. Windmill Vitamin D3 1000 IU Bone & Immune Support Tablets 100ct is Made in the USA, Non-GMO, Gluten-Free, No Artificial Colors, No Artificial Flavors, No Preservatives. Moore Vitamins sources directly from authorized Windmill distributors through Sterling Distributors, our wholesale partner, rather than reselling marketplace inventory where counterfeit and grey-market product frequently appears. Authenticity is a sourcing-chain problem, not a labeling one: only product that travelled from the manufacturer through an authorized distribution chain can be trusted to match the front-of-label claim. Orders ship same-day from our Florida fulfillment center on weekdays placed by 4 PM ET.

Windmill Vitamin D3 1000 IU Bone & Immune Support Tablets 100ct is generally safe to combine with other supplements — most vitamins and minerals coexist without issue at label doses, which is why multivitamins exist in the first place. Most vitamin and mineral supplements can be taken together safely. Two practical rules cover most stacking questions: first, minerals that compete for the same absorption pathways (calcium, iron, zinc, and magnesium) should be spaced at least two hours apart rather than swallowed in one handful; second, check your combined routine for ingredient overlap, since the same nutrient appearing in a multivitamin, a gummy, and a standalone supplement can quietly add up past the tolerable intake level. Fat-soluble vitamins (A, D, E, K) also accumulate in the body rather than washing out daily, so overlap matters more there. If you take prescription medication, are pregnant or nursing, or have a medical condition, consult your healthcare provider before adding any new supplement to your routine.

We offer a 30-day satisfaction guarantee: return any unopened Windmill Vitamin D3 1000 IU Bone & Immune Support Tablets 100ct within 30 days of delivery for a full refund, no questions asked and no restocking fee. To start a return, email contact@moorevitamins.com with your order number and reason — our team responds within one business day with the return address and instructions, and we recommend shipping with a trackable method. Because supplements are regulated for health and safety, we can't accept opened products back unless they arrived damaged or defective; in that case you get a full refund or free replacement, and a photo of the issue is usually all we need rather than a return shipment. Refunds are processed to your original payment method within 7 business days of receiving your return, plus the 3–5 days your bank may take to post it. Subscription shipments already processed follow this same policy.

Yes. Subscribe & Save gets you 10% off every recurring order of Windmill Vitamin D3 1000 IU Bone & Immune Support Tablets 100ct — not just the first one — with free shipping on orders over $25. Choose a delivery interval that matches how fast you go through a bottle (monthly, every two months, or every three months) and each refill ships automatically so you never run out mid-routine, which matters because supplements only work when they're taken consistently. There's no commitment, no minimum number of orders, and no cancellation fee: you can pause, skip a delivery, or cancel anytime from your account dashboard, or by emailing us if you'd rather not log in. Price-wise, the subscription discount applies on top of the regular price shown, and you'll see it as its own line item at checkout. If you're new to Windmill Vitamin D3 1000 IU Bone & Immune Support Tablets 100ct, a common approach is trying one bottle first, then subscribing once you know it fits your routine.

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