Vitamin E Supplement

2,618 Reviews Scanned

In order to provide you with accurate and valuable pieces of information and reviews, we have conducted in-depth research for the best vitamin e supplement of 2023. In addition, you will find our top picks and highest-reviewed products in the section below.
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1 Nature Made Vitamin E 180 mg (400 IU) dl-Alpha, Dietary Supplement for Antioxidant Support, 300... Nature Made Vitamin E 180 mg (400 IU) dl-Alpha, Dietary Supplement for Antioxidant Support, 300...
2 Nature’s Bounty Vitamin E 1000 IU Softgels, Supports Antioxidant Health & Immune System, 1 Pack,... Nature’s Bounty Vitamin E 1000 IU Softgels, Supports Antioxidant Health & Immune System, 1...
3 Kirkland Signature Vitamin E 400 I. U. 500 Softgels Per Bottle Kirkland Signature Vitamin E 400 I. U. 500 Softgels Per Bottle
4 NOW Supplements, Vitamin E-400 IU, D-Alpha Tocopheryl, Antioxidant Protection*, 250 Softgels NOW Supplements, Vitamin E-400 IU, D-Alpha Tocopheryl, Antioxidant Protection*, 250 Softgels
5 Solgar Vitamin E 268 MG (400 IU) Mixed (d-Alpha Tocopherol & Mixed Tocopherols - Supports Immune... Solgar Vitamin E 268 MG (400 IU) Mixed (d-Alpha Tocopherol & Mixed Tocopherols - Supports Immune...
6 Solgar Vitamin E 670 mg (1000 IU), 100 Mixed Softgels - Natural Antioxidant, Skin & Immune System... Solgar Vitamin E 670 mg (1000 IU), 100 Mixed Softgels - Natural Antioxidant, Skin & Immune System...
7 NOW Supplements, Natural Vitamin E-Oil Liquid (D-Alpha Tocopherol), Antioxidant Protection*, 1-Ounce NOW Supplements, Natural Vitamin E-Oil Liquid (D-Alpha Tocopherol), Antioxidant Protection*, 1-Ounce No ratings yet
8 Sundown Vitamin E for Immune Support, Gluten-Free, Dairy-Free, Non-GMO, 180mg 400IU Softgels, 100... Sundown Vitamin E for Immune Support, Gluten-Free, Dairy-Free, Non-GMO, 180mg 400IU Softgels, 100...
9 Garden of Life Vitamin E - Vitamin Code Raw Vitamin E Supplement with Vitamins A, D & K Plus... Garden of Life Vitamin E - Vitamin Code Raw Vitamin E Supplement with Vitamins A, D & K Plus...
10 Pure Encapsulations Vitamin E (with Mixed Tocopherols) | Antioxidant Supplement to Support Cellular... Pure Encapsulations Vitamin E (with Mixed Tocopherols) | Antioxidant Supplement to Support...
11 Nordic Naturals Vitamin E Complex, Unflavored - 30 Soft Gels - 6 Forms of Vitamin E for Antioxidant... Nordic Naturals Vitamin E Complex, Unflavored - 30 Soft Gels - 6 Forms of Vitamin E for... No ratings yet
12 MaryRuth’s USDA Organic Vitamin E Liquid Drops | 2 Month Supply | Immune Support, Bone & Joint... MaryRuth’s USDA Organic Vitamin E Liquid Drops | 2 Month Supply | Immune Support, Bone & Joint...
13 Thorne Ultimate-E - Contains All of The Natural Forms of Vitamin E - 60 Gelcaps Thorne Ultimate-E - Contains All of The Natural Forms of Vitamin E - 60 Gelcaps No ratings yet
14 Solgar Vitamin E 67 mg (100 IU), 100 Mixed Softgels - Natural Antioxidant, Skin & Immune System... Solgar Vitamin E 67 mg (100 IU), 100 Mixed Softgels - Natural Antioxidant, Skin & Immune System... No ratings yet
15 Micro Ingredients Vitamin E 1000 IU, 240 Softgels | Pure Vitamin E Oil Pills | Antioxidant... Micro Ingredients Vitamin E 1000 IU, 240 Softgels | Pure Vitamin E Oil Pills | Antioxidant... No ratings yet
16 NATURELO Vitamin E - 180 mg (300 IU) of Natural Mixed Tocopherols from Organic Whole Foods -... NATURELO Vitamin E - 180 mg (300 IU) of Natural Mixed Tocopherols from Organic Whole Foods -... No ratings yet
17 E Annatto Tocotrienols Deltagold 125mg, Vitamin E Tocotrienols Supplements 60 Softgel, Tocopherol... E Annatto Tocotrienols Deltagold 125mg, Vitamin E Tocotrienols Supplements 60 Softgel, Tocopherol...
18 Carlyle Vitamin E Plus Mixed Tocopherols | 1000 IU (671mg) | 150 Softgels | Non-GMO and Gluten Free... Carlyle Vitamin E Plus Mixed Tocopherols | 1000 IU (671mg) | 150 Softgels | Non-GMO and Gluten...
19 Bluebonnet Nutrition Vitamin E 400 IU (268 mg) Mixed Tocopherols Softgels, Free Radical Portection &... Bluebonnet Nutrition Vitamin E 400 IU (268 mg) Mixed Tocopherols Softgels, Free Radical Portection...
20 Integrative Therapeutics Vitamin E - 400 IU Full-tocopherol Form of Vitamin E - Supplement to... Integrative Therapeutics Vitamin E - 400 IU Full-tocopherol Form of Vitamin E - Supplement to... No ratings yet

SaleBestseller No. 1
Nature Made Vitamin E 180 mg (400 IU) dl-Alpha, Dietary Supplement for Antioxidant Support, 300...
  • Provides 180 mg (400 IU) of Vitamin E, which is an antioxidant that helps neutralize free radicals in the body and supports a healthy immune system
  • This antioxidant supplement is the dl-Alpha form of Vitamin E, which supports the body's natural immune defenses
  • Adults, take one Vitamin E softgel daily with water and a meal
  • Sourced from high-quality ingredients, these Nature Made Vitamin E 400 IU softgels are gluten free and contain no color added, no artificial flavors...
  • United States Pharmacopeia (USP) Verified, #1 Pharmacist Recommended Vitamin & Supplement Brand*
Bestseller No. 2
Nature’s Bounty Vitamin E 1000 IU Softgels, Supports Antioxidant Health & Immune System, 1 Pack,...
  • POTENT ANTIOXIDANT PROPERTIES: Vitamin E is an important antioxidant that helps fight free radicals in the body; (1) Free radicals may contribute to...
  • IMMUNE SUPPORT: Each softgel contains 1000 IU Vitamin E to help support healthy immune function and maintain overall health (1)
  • DL-ALPHA TOCOPHEROL: Nature’s Bounty 1000 IU Vitamin E softgels contain dl-Alpha Tocopherol which is a form of Vitamin E often used for its...
  • NON-GMO & GLUTEN FREE: Nature’s Bounty is committed to safety and purity in all of our supplements; Our Vitamin E softgels contains no gluten and...
  • UNSURPASSED QUALITY AND VALUE: Using the latest breakthroughs in nutritional science and the finest ingredients Nature’s Bounty provides supplements...
SaleBestseller No. 3
Kirkland Signature Vitamin E 400 I. U. 500 Softgels Per Bottle
  • Kirkland Signature Vitamin E 400 I. U. 500 Softgels Per Bottle
  • Supports a healthy immune function, heart function, and antioxidant protection.
  • USP Verified dietary supplement
Bestseller No. 4
NOW Supplements, Vitamin E-400 IU, D-Alpha Tocopheryl, Antioxidant Protection*, 250 Softgels
  • NATURAL 400 IU D-ALPHA TOCOPHERYL/EASY TO SWALLOW SOFTGELS: Vitamin E is a major fat-soluble antioxidant that is particularly important for...
  • ANTIOXIDANT PROTECTION*: In addition to its antioxidant activities, vitamin E is also vital for a normal immune function and for maintenance of a...
  • CERTIFICATIONS/CLASSIFICATIONS: Made without Gluten, Dairy Free, Egg Free, Non-GMO, Corn Free, Kosher Contains Gelatin
  • GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our...
  • Packaged in the USA by a family owned and operated company since 1968
SaleBestseller No. 5
Solgar Vitamin E 268 MG (400 IU) Mixed (d-Alpha Tocopherol & Mixed Tocopherols - Supports Immune...
  • Protect Cells From Oxidative Stress; Vitamin E is an essential nutrient and a potent antioxidant that helps fight free radicals in the body; Free...
  • Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product...
  • Healthy Immune System Support; The body needs Vitamin E; As the body’s primary, fat-soluble antioxidant, Vitamin E provides essential nutritional...
  • Enhanced Absorption; Oil-based softgels to promote optimal absorption and assimilation; The naturally sourced Vitamin E (d-alpha tocopherol) in Solgar...
  • Gluten And Dairy Free; Formula provides Vitamin E as d-Alpha Tocopherol, d-Gamma, d-Delta and d-Beta Tocopherols; Free of: gluten, wheat, dairy,...
SaleBestseller No. 6
Solgar Vitamin E 670 mg (1000 IU), 100 Mixed Softgels - Natural Antioxidant, Skin & Immune System...
  • Powerful Antioxidant; Vitamin E is the body's primary, fat-soluble antioxidant; As an antioxidant, it helps fight cell-damaging free radicals; Free...
  • Skin & Immune Support; Vitamin E provides nutritional support for the skin, and the immune system
  • Optimal Absorption; This formulation provides Vitamin E (as d-Alpha Tocopherol) and d-Gamma, d-Delta, and d-Beta Tocopherols; It is offered in...
  • Gluten, Wheat & Dairy Free; Solgar Vitamin E is free of: gluten, wheat, dairy, yeast, sugar, artificial flavor, sweetener, preservatives, and color;...
  • The Gold Standard: For over 70 years, Solgar has been committed to quality, health, and well-being. Our mission is to create the finest nutritional...
SaleBestseller No. 7
NOW Supplements, Natural Vitamin E-Oil Liquid (D-Alpha Tocopherol), Antioxidant Protection*, 1-Ounce
  • LIQUID VITAMIN E SUPPLEMENT/8 DROPS PER SERVING: Contains 23,000 IU of d-alpha Tocopherol
  • Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product...
  • ANTIOXIDANT PROTECTION*: Vitamin E is a well-known antioxidant vitamin and one of the body’s primary free radical-fighting nutrients.*
  • CLASSIFICATIONS/CERTIFICATIONS: Non-GMO, Kosher, Vegan
  • GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our...
SaleBestseller No. 8
Sundown Vitamin E for Immune Support, Gluten-Free, Dairy-Free, Non-GMO, 180mg 400IU Softgels, 100...
  • IMMUNE SUPPORT — Vitamin E fights cell-damaging free radicals and maintains immune system health(3)
  • SKIN, HAIR, NAIL HEALTH — Vitamin E has nourishing, anti-aging properties, giving your skin, hair, nails and face a healthy glow; perfect for your...
  • GENERAL GOOD HEALTH — Enjoy antioxidant protection to maintain overall wellness(3)
  • CLEAN(1) HEALTH SUPPLEMENT— Non-GMO(2) and free of artificial flavors; gluten-free, wheat-free, dairy-free, lactose-free
  • THIRD PARTY TESTED — Sundown products are always third-party tested for safety, quality and purity. We are a proudly American company with millions...
SaleBestseller No. 9
Garden of Life Vitamin E - Vitamin Code Raw Vitamin E Supplement with Vitamins A, D & K Plus...
  • VITAMIN E WITH SELENIUM: Our vitamin E capsules provide whole food Vitamin E from Sunflower Oil with naturally occurring mixed tocopherols, along with...
  • SUPPORTING ANTIOXIDANTS: Our E vitamin contains 23 organically grown fruits and vegetables, which add supporting antioxidants, vitamins and nutrient...
  • BREAST & PROSTATE HEALTH: This RAW, food created Vitamin E supplement aids in heart health, immune system support, digestive support, eye health and...
  • PROBIOTICS & ENZYMES: Our plant based E vitamin includes a RAW Probiotic and Enzyme blend for digestive support, plus a fruit & vegetable blend for...
  • SAY YES TO CLEAN SUPPLEMENTS: Our whole food vitamin E is Third-Party Certified Non GMO, Gluten Free Kosher, and RAW—no high heat, synthetic...
Bestseller No. 10
Pure Encapsulations Vitamin E (with Mixed Tocopherols) | Antioxidant Supplement to Support Cellular...
  • Antioxidant Protection: Vitamin E, a powerful chain-breaking antioxidant and free radical scavenger.
  • Cardiovascular Health: Vitamin E is crucial to proper cellular function and physiological functions, especially cardiovascular functioning.*
  • Muscle Function: Vitamin E plays a beneficial role in the cellular respiration of muscles, especially cardiac and skeletal muscles.*
  • Pure Quality: Our supplements are made with only premium ingredients sourced from trusted suppliers and guided by our nutritional experts, then...
  • Pure Difference: What makes us different isn't just our process or what goes into our supplements -- what we leave out matters, too. Pure...
Bestseller No. 11
Nordic Naturals Vitamin E Complex, Unflavored - 30 Soft Gels - 6 Forms of Vitamin E for Antioxidant...
  • WHY VITAMIN E - Vitamin E is a fat-soluble antioxidant that helps stop the production of free radicals when fat undergoes oxidation.*
  • INTENSIVE SUPPORT- This unique soy-free formula helps protect cells from oxidative stress to promote cellular health, metabolic balance, and a healthy...
  • BETTER ABSORPTION - Vitamin E Complex provides six forms of the master antioxidant vitamin E in one.
  • PURITY GUARANTEED - Everything we make is third-party tested, surpassing the strictest international standards for purity & freshness. This product is...
  • ETHICAL INNOVATION - Nordic Naturals has always been at the forefront of sustainable & ethical practices in the natural products industry. Through...
SaleBestseller No. 12
MaryRuth’s USDA Organic Vitamin E Liquid Drops | 2 Month Supply | Immune Support, Bone & Joint...
  • Vitamin E Liquid Drops: Support your immune system and overall health & wellness! Vitamin E is considered an essential vitamin for everyone, as our...
  • Multiple Benefits: Our Organic Vitamin E Liquid Drops have antioxidant properties that are vital for your body, limiting the damage done by free...
  • Vegan Formula: Per Serving (30 Drops): 16 mg Vitamin E (as D-alpha tocopherol acetate). Other Ingredients: Organic Medium Chain Triglyceride (MCT)...
  • Easy-to-Take Liquid Drops: Shake gently before each use. Once daily, take directly by mouth. Best taken with food. Use the following to assess dose or...
  • For Most Lifestyles: MaryRuth's Vitamin E Liquid Drops are USDA Organic, Non-GMO, Vegan, Dairy Free, Gluten Free, Wheat Free, Corn Free, Sugar Free,...
Bestseller No. 13
Thorne Ultimate-E - Contains All of The Natural Forms of Vitamin E - 60 Gelcaps
  • Mixed Tocopherols: Contains all the natural forms of vitamin E
  • Optimal Purity: Molecular distillation removes allergenic soy residues, no soy oil added
  • Antioxidant: Recent studies indicate mixed tocopherols provide optimal antioxidant effect*
  • Cardiovascular: Numerous clinical studies have shown benefit to the cardiovascular system*
  • Free From: Every Thorne product is made with the purest possible ingredients - without gluten or other major allergens (eggs, tree nuts, peanuts) This...
SaleBestseller No. 14
Solgar Vitamin E 67 mg (100 IU), 100 Mixed Softgels - Natural Antioxidant, Skin & Immune System...
  • Powerful Antioxidant; Vitamin E is the body's primary, fat-soluble antioxidant; As an antioxidant, it helps fight cell-damaging free radicals; Free...
  • Skin & Immune Support; Vitamin E provides nutritional support for the skin, and the immune system
  • Optimal Absorption; This formulation provides Vitamin E (as d-Alpha Tocopherol) and d-Gamma, d-Delta, and d-Beta Tocopherols; It is offered in...
  • Gluten, Wheat & Dairy Free; Solgar Vitamin E is free of: gluten, wheat, dairy, yeast, sugar, artificial flavor, sweetener, preservatives, and color;...
  • The Gold Standard: For over 70 years, Solgar has been committed to quality, health, and well-being. Our mission is to create the finest nutritional...
Bestseller No. 15
Micro Ingredients Vitamin E 1000 IU, 240 Softgels | Pure Vitamin E Oil Pills | Antioxidant...
  • Micro Ingredients offers pure vitamin E softgels that come in a convenient single serving daily formula. It contains authentic vitamin E ingredients...
  • Each pouch provides 240 max potency softgels that only takes 1 per serving to receive a 1,000iu dose. That equals an 8-month supply of this essential...
  • Taking vitamin E on a regular basis will promote natural antioxidant properties for nearly every cell within the body. It is shown to support ultimate...
  • Vitamin E in the dl-Alpha form works within the body by combating any free radicals that promote oxidative stress. These are the main contributing...
  • Premium non-GMO and non-irradiated vitamin E. Made without soy, dairy, gluten, flavors, artificial colors, and tree nuts. Ingredients must pass our...
SaleBestseller No. 16
NATURELO Vitamin E - 180 mg (300 IU) of Natural Mixed Tocopherols from Organic Whole Foods -...
  • Natural Vitamin E: Complete with plant-based sources of vitamin E, such as organic coconut, rice bran, sunflower, avocado, mango and kiwi. Natural...
  • High Potency: 3-month supply of capsules containing 180 mg of Vitamin E. Take one a day to get a complete, whole food blend of mixed tocopherols —...
  • Powerful Benefits: A potent antioxidant and anti-aging nutrient, vitamin E benefits the whole body, supporting memory, heart, liver, & eye health. As...
  • Premium Quality: Unlike cheaper brands, this product is made with Premium Ingredients that are Non-GMO, Natural, Gluten Free, Soy Free, Vegan &...
  • Satisfaction Guaranteed: Proven effectiveness with a full Money-Back Guarantee. The best supplements come from nature, not from a lab, experience the...
Bestseller No. 17
E Annatto Tocotrienols Deltagold 125mg, Vitamin E Tocotrienols Supplements 60 Softgel, Tocopherol...
  • SUPERIOR SOURCE OF VITAMIN E -Research shows that the potential of tocotrienols is 50X more than the commercially available Vitamin E tocopherols....
  • DELTA GOLD ~ 50X STRONGER AND FASTER VITAMIN E-Delta gold Eannatto is 90% Delta and 10% Gamma tocotrienols (Tocopherols-free). This is...
  • COUNTLESS BENEFITS TO EXPERIENCE-Studies show advanced Cardiovascular, cellular, and muscle recovery, and support for healthy ageing with Vitamin...
  • WHY WELLNESS EXTRACT?-WE focus on science-based ingredients and proprietary manufacturing processes to keep the highest standard in manufacturing and...
  • RECOMMENDED USE & STORAGE-Wellness Extract Eannatto Tocotrienols are small and easy to swallow soft gels. It is suggested to be taken with a meal and...
SaleBestseller No. 18
Carlyle Vitamin E Plus Mixed Tocopherols | 1000 IU (671mg) | 150 Softgels | Non-GMO and Gluten Free...
  • VITAMIN E 1000: Get premium nutritional support with Carlyle's naturally sourced Vitamin E 1000!
  • EXPERT SUPPORT: Delivers 1,000 IU (671 mg) of Vitamin E plus mixed Tocopherols in each softgel
  • ROOTED IN WELLNESS: Carlyle provides premium, honest supplements in your pursuit to healthy living
  • CARLYLE MANUFACTURERS: Laboratory Tested, Trusted Ingredients, Superior Quality, 100% Guaranteed!
  • NATURALLY FREE OF: Gluten, Wheat, Yeast, Lactose, Artificial Sweetener, Preservatives & Non-GMO
Bestseller No. 19
Bluebonnet Nutrition Vitamin E 400 IU (268 mg) Mixed Tocopherols Softgels, Free Radical Portection &...
  • Vitamin E 400 IU softgels with Mixed Tocopherols
  • Antioixdant Protection ♦
  • 100 Softgels, 100 Servings
  • Gluten-Free, Dairy-Free
  • Free of milk, egg, fish, crustacean shellfish, tree nuts, peanuts and wheat. Also free of corn, yeast, gluten, barley, rice, sodium and sugar.
Bestseller No. 20
Integrative Therapeutics Vitamin E - 400 IU Full-tocopherol Form of Vitamin E - Supplement to...
  • The vitamin E formula in this supplement supports heart health and antioxidant activity*
  • The vitamin E family is made up of different compounds called tocopherols, including alpha, gamma, beta and delta
  • Vitamin E is an antioxidant
  • Gluten free and dairy free; no salt, wheat or artificial colors

What should you look for when purchasing the best vitamin e supplement?

To purchase the right product, you need to research its qualities and flaws.

Diversity is highly important since it offers options for different budgets and lifestyles. Choosing the best vitamin e supplement requires asking yourself the right questions to ensure the product is precisely what you need.

To make your money’s worth, you should thoroughly research the options you are presented with and ask the following questions:

  • How does buying vitamin e supplement benefit me?
  • Is it worth the price?
  • Which vitamin e supplement is the best option to go for in the nowadays market?
  • What features are essential when purchasing the vitamin e supplement?
  • Which brand of the this is most trustworthy?
  • Which vitamin e supplement has the best price/value ratio?

You are bound to have even more vitally important questions when purchasing the vitamin e supplement. The best way to inform yourself about it is a meticulous exploration of internet resources and research for second opinions and customer reviews.

Various websites can hold pieces of information necessary for purchasing a top-notch product. Forums, reviews, and rating websites can all offer you the instrumental info needed to buy the best possible vitamin e supplement. In order to get accurate information, you should explore trustworthy websites that have a history of providing customers with specific and genuine content.

Curee.org worked hard and conducted comprehensive research to get you the necessary information regarding the vitamin e supplement.

It helps us to put together a high-quality buying guide that will provide you with pros and cons, features, and reasons the product is the right choice for you. To get the vitamin e supplement that will suit your needs best, you should consider the following factors:

Advantages of the Brand

Every brand of vitamin e supplement holds different values to it. Typically, each and every brand will have something unique that will attract your attention and make you consider their product as the leading option. The more unique the feature is, the more it will allure you to the product and its value.

Features

Each product has some value that separates it from the pack. Therefore, always ask yourself what features are relevant when purchasing the vitamin e supplement? What is essential for this product to have?

Value of the product

This factor is crucial since it can tell you how much value you will get for your money’s worth when purchasing this.

Customer reviews

The second opinion always matters when you cannot decide on which product you should opt for. These reviews will paint you the picture of the vitamin e supplement by real-world customers that had experience with the product and inform you on how well it served them.

Customer ratings


Customer ratings are similar to reviews but offer you a number or star rating of the vitamin e supplement, which can tip the scales when you are unsure which product to choose.

Reliability

To get the vitamin e supplement that will serve your purposes and pay off, you need to choose a reliable and durable one. High-quality product equals wise investment and peace of mind.

Beware off-brands

Purchasing the off-brand vitamin e supplement is unwise. Always look for reliable brands that offer you the highest possible quality and are trusted and recognized as a legitimate option.

Curee.org always tends to bring its visitors accurate and valuable information that is relevant to the vitamin e supplement. We always refresh and update our content since our priority is and has always been top-notch user experience.

If you have any questions or suggestions about our presentation of the this product, please let us know. You can contact us here, and if our article has made you interested in our work, you can find more about us and better realize our vision and what it represents.

FAQ:

Q: What are the best natural vitamin E supplements?

A: Puritan’s Pride Vitamin E-1000 More info Buy on Amazon.com Solgar Vitamin E 400 More info Buy on Amazon.com Now Foods E-400 More info Buy on Amazon.com Pure Encapsulations Vitamin E More info Buy on Amazon.com Sundown Naturals Vitamin E More info Buy on Amazon.com Garden of Life Vitamin Code Raw Vitamin E More info Buy on Amazon.com

Q: Which vitamin E is best?

A: Puritan’s Pride Vitamin E-1000. Solgar Vitamin E 400. Now Foods E-400. Pure Encapsulations – Vitamin E. Sundown Naturals Vitamin E. Garden of Life Vegetarian Vitamin E. Nature Made Vitamin E 400. Swanson Vitamin E. Nature’s Bounty Natural E-Complex. Spring Valley Vitamin E 400.

Q: Is taking too much vitamin E bad for You?

A: Vitamin E hasn’t proven to be good for the heart, and now a study suggests that too much vitamin E — daily doses of 400 IU or more — actually increases the risk of dying, according to new findings.