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Supplement Guide Disclaimer
The information presented in Supplement Guide is for informational purposes only and should not be considered medical advice. Nutritional recommendations are based on established guidelines for people of average health and on associations between vitamins, minerals, and herbs with health conditions from published scientific studies (human, animal, or in vitro), clinical experience, or traditional usage. These associations may not be true for all individuals and are not based on specific product brands or formulations. Nutritional and herbal products may vary widely in ingredient purity, concentration, and combinations, which may affect people differently. Consult your doctor, pharmacist, or other professional for any health problem and before adding supplements to your self-care practices or discontinuing any prescribed medications. It is important not to make any changes in your self-care, including taking supplements, before or after a surgery without your doctor's express recommendation. In addition, please consult with your healthcare practitioner to make sure that your cumulative daily intake of copper, selenium, zinc, vitamin B6, folic acid, or any other nutrient, does not exceed established, tolerable upper intake levels.
Information and statements regarding dietary supplements have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease.
By using Supplement Guide you understand that recommendations are in no way intended as a substitute for medical counseling and neither the publisher nor the authors have liability or responsibility to any person or entity receiving or using this information.
Copyright© 2021 Life Extension. All rights reserved.
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- Vitamins & Supplements
- Letter Vitamins
Vitamins B, C, D, E and K. Fill your Nutritional Gaps


Fill in your Nutritional Gaps for Whole-Body Health
Even if you try to eat a balanced diet, it’s difficult to get the optimal doses of all the vitamins your body needs. Life Extension® offers a wide range of supplements that help you with all the healthy essentials, including specialized products that deliver vitamins B, C, D, E and K.
4 Reasons Why Everyone Should Take Our Vitamin Supplements
- Provides support for healthy bones
- Promotes healthy immune system function
- Helps maintain already-healthy blood pressure
- Encourages healthy organ function
Our Recommendation
Vitamin D3
The sunshine vitamin is key to strong bones & immune health
125 mcg (5000 IU), 60 softgels
$7.50
Compare Formulations
We offer the letter vitamins in various forms and dosages, as well as comprehensive vitamin and nutrient formulas. Find the form that fits you.

Vitamin B
Maintaining ample vitamin B levels supports optimal organ function, healthy metabolism, cognitive health and other essential metabolic processes. Our Best Seller BioActive Complete B-Complex helps you get the B vitamins your body needs on a daily basis.
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Vitamin C
Vitamin C is known for maintaining a healthy immune system, but it has whole-body health benefits as well. We pair our vitamin C with other nutrients, such as quercetin and a patented form of beta-glucan, for additional support.
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Vitamin D
While our bodies synthesize vitamin D when exposed to sunlight, many of us use sunscreen or avoid direct sun exposure, and for good reason. But this can impact vitamin D production. Our award-winning Vitamin D3 with Sea-Iodine™ helps ensure you get enough vitamin D, and also iodine, which is essential for thyroid health.
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Vitamin E
Vitamin E is a group of eight different antioxidant compounds found in plants. These compounds are some of the most researched and most important nutrients to include in your daily regimen. Vitamin E is divided into two categories, tocopherols and tocotrienols, each with their own set of health benefits.
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Vitamin K
Vitamin K supports arterial and bone health. Our Best in Class Super K Elite is the most comprehensive vitamin K formula we offer. It provides a variety of vitamin K forms at the clinically-studied dosages designed to give you the optimum health benefits.
See Vitamin K ProductsVitamin B
Healthy vitamin B levels support optimal organ function, healthy metabolism, cognitive health and other essential metabolic processes.
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Be all that you can “B” with an energized body and sharp mind. Our BioActive Complete B-Complex offers the full spectrum of vitamin B benefits, in a highly absorbable formula.
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Benfotiamine, a fat-soluble form of vitamin B1 (thiamine), provides healthy blood sugar metabolism support and helps protect the body’s tissues against advanced glycation end products (AGEs) and oxidative stress.
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Our best-selling supplement for supporting already-healthy cholesterol levels contains niacin, which is crucial for supporting the healthy metabolism of glucose, fat and alcohol.
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Our Optimized Folate formula promotes both cardiovascular and cognitive health with 1,700 mcg of folate in the form of 5-MTHF, the metabolically active form of folic acid.
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Our BioActive Folate & Vitamin B12 includes biologically active forms of folate and vitamin B12 to promote heart, brain and GI tract health.
Essential vitamin B12 lozenges that dissolve in your mouth
- 1 mg 60 vegetarian lozenges
- 5 mg 60 vegetarian lozenges
- 500 mcg 100 vegetarian lozenges
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Our Vitamin B12 lozenges can be dissolved in your mouth or chewed as a convenient way to ensure optimal B12 levels, which support healthy homocysteine levels, brain health and cognition.
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Homocysteine Resist contains a selection of B vitamins specially formulated to help your body maintain already-healthy levels of homocysteine and to support heart and brain health.
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Biotin is a water-soluble vitamin that belongs to the vitamin B family. It’s necessary for the production of keratin, a protein that is a structural component of hair, nails and skin.
Essential B vitamin supports heart, nerve & eye health
- 100 vegetarian capsules 250 mg
- 60 vegetarian capsules 100 mg
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Vitamin B6 plays a crucial role in numerous life processes. Pyridoxal 5’-phosphate, the metabolically active form of vitamin B6, participates in over 100 enzymatic reactions in the body.
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Pantothenic acid (vitamin B5) is an important component of coenzyme A, which assists in several metabolic pathways and is necessary for the transfer of fats to and from cells.
Vitamin C
Support a healthy immune system and other whole-body health benefits with vitamin C and formulas with vitamin C plus complementary nutrients.
Vitamin C plus ultra-absorbable quercetin for immune support
- vegetarian tablets 250 count
- vegetarian tablets 60 count
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Vitamin C benefits are enhanced with our new Bio-Quercetin Phytosome, which is up to 50 times more absorbable than standard quercetin.
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Our Buffered Vitamin C Powder contains four buffering minerals that, when mixed with water, is non-irritating to the stomach and intestinal lining.
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Vitamin C is good for you—but did you know that with most conventional formulas, at higher doses, the less you absorb? Our Vitamin C 24-hour Liposomal Hydrogel™ Formula absorbs much better than standard vitamin C, staying in your system up to 24 hours.
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Ascorbyl Palmitate is a fat-soluble vitamin C that delivers antioxidant protection to areas of the body where conventional vitamin C (ascorbic acid) can’t reach.
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Our Fast C® and Bio-Quercetin Phytosome formula maximizes the absorption and health benefits of vitamin C. It also contains calcium and magnesium to neutralize acid, protecting sensitive stomachs.
Vitamin D
Vitamin D helps preserve youthful cognitive function, supports bone and immune system health, helps maintain already-healthy blood pressure and more. Our Vitamin D has been a 2-time winner of the ConsumerLab.com Survey of Supplement Users, delivering vitamin D3 (as cholecalciferol) in easy-to-swallow forms.
The sunshine vitamin is key to strong bones & immune health
- 125 mcg (5000 IU) 60 softgels
- 175 mcg (7000 IU) 60 softgels
- 25 mcg (1000 IU) 250 softgels
- 25 mcg (1000 IU) 90 softgels
- 50 mcg (2000 IU) 29.57 liquid
- 50 mcg (2000 IU) 29.57 liquid (Mint)
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Many of us don’t get enough vitamin D from sunshine and diet alone—but we need this nutrient for healthy bones and a strong immune system. Our high-potency supplement fills in the gaps.
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This formula delivers 125 mcg (5,000 IU) of vitamin D3, 2100 mcg of vitamin K and 1000 mcg of iodine in a convenient, once-daily supplement to support bone, brain, thyroid and vascular health.
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Maintaining healthy levels of vitamin D helps support cognitive health, promotes bone health and encourages healthy blood vessel function. It also helps maintain already-healthy blood pressure levels.
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Many sources of supplemental vitamin D3 come from animals. Our formula delivers 125 mcg (5000 IU) of vitamin D3, with absolutely no animal byproducts.
Vitamin E
Vitamin E is important for whole-body health. We offer stand-alone tocopherol and tocotrienol formulas, a combination of both, and novel formulations that combine vitamin E with essential nutrients such as selenium.
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Gamma E Mixed Tocopherols & Tocotrienols contains the complete spectrum of vitamin E compounds for potent antioxidant benefits.
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Life Extension’s Super Vitamin E supplement provides a non-synthetic and highly bioavailable form of vitamin E for maximum whole-body health benefits.
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We added sesame lignans after uncovering research that suggests they may enhance vitamin E activity when combined with gamma tocopherols.
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The vitamin E in our Super Absorbable Tocotrienols supplement supports your arteries, brain, eyes and immune system, and promotes healthy hair growth.
Vitamin K
Support your arterial and bone health with Vitamin K. Our formulas include several forms of K at the clinically-studied dosages designed to give you the optimum health benefits.
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Our Super K combines vitamin K1 with two forms of vitamin K2 in a once-daily vitamin K supplement to help support bone & heart health.
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Different kinds of vitamin K are known for different things. Our Super K Elite delivers vitamin K1 as well as several different forms of K2 in order to support heart and arterial health as well as healthy bone density.
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Low-Dose Vitamin K2 contains the menaquinone-7 (MK7) form of vitamin K2, which metabolizes slowly. This makes MK7 more available to provide a more consistent supply of vitamin K to the body.
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Vitamin K2 is essential to maintaining strong, healthy bones. Here’s why: studies show that 45,000 mcg (45 mg) of a special form of K2 (menaquinone-4) is especially effective at encouraging healthy bone mineral density.
Related Products
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Our Once-Daily Health Booster delivers the health benefits of essential fat-soluble vitamins and nutrients from plant extracts and a phospholipid blend for eye health, all contained in one convenient softgel.
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PQQ’s benefits stem from our special formula, which is designed to promote healthy mitochondria, the cellular structures that produce energy needed by the entire body.
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Our best-selling Super Omega-3 EPA/DHA formula is an IFOS™ 5-star certified fish oil packed with EPA and DHA fatty acids, olive polyphenols and more to promote heart health, brain health, and beyond.
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Nutrients like lutein and astaxanthin benefit eye health. Our MacuGuard® formula delivers these nutrients, plus zeaxanthin, meso-zeaxanthin, saffron and more for comprehensive eye health support.
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Our PQQ (pyrroloquinoline quinone) supplement is a powerful antioxidant that supports the growth of brand-new mitochondria, to support cellular energy.
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We’ve augmented our ultra-bioavailable Curcumin Elite™ curcumin-fenugreek combo with complementary ginger and turmerone extracts to create our Best in Class curcumin formula.
Related Health Information
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