Immunity Booster Kit

Immunity Booster Kit


Extraordinary Immune Defense and Support
  • Nutrient "superstars" support defense system
  • Extraordinary multi-antioxidant power
  • Reduces aches and soreness

Immunity Booster Kit contains:
EnDuro D
Endurance C


No option selected. Please select Title

Vitamins D3 & K2, along with Vitamin C, are universally considered as two of the most important nutrients for supporting and positively influencing a wide range of important bodily functions. Perhaps the most important of those functions is maintaining a strong defense system. With EnDuro D your body receives efficacious amounts of both D3 and K2. Endurance C is unlike your typical vitamin C supplement, as it contains several other nutrients/compounds that complement vitamin C perfectly. This two-product combination protects and supports a strong defense system all year long!

Immunity Booster Kit FAQs

How important is vitamin D for the immune system?

Space limits listing all of the roles that vitamin D plays in the body, but it’s fair to say that since nearly every bodily cell and tissue has vitamin D receptors, they all require vitamin D to function properly [1, 2]. Regarding the immune system, the vitamin D in EnDuro D is very much a “front line defense” nutrient.

A portion of the conclusion from one piece of vitamin D/immune system research states: “Vitamin D has important functions beyond those of calcium and bone homeostasis which include modulation of the innate and adaptive immune responses. Vitamin D deficiency is prevalent in autoimmune disease. Cells of the immune system are capable of synthesizing and responding to vitamin D.” [3]

Commenting on other vitamin D/immune system research [4], Dr. Richard Mellanby writes: "Low vitamin D status has long been implicated as a significant risk factor for the development of several autoimmune diseases. Our study reveals one way in which vitamin D metabolites can dramatically influence the immune system."

Lastly, highly regarded vitamin D expert, Dr. Richard F Holick, states that vitamin D “is capable of regulating a wide variety of genes that have important functions in regulating cell growth, modulating immune function and cardiovascular health. Epidemiologic evidence and prospective studies have linked vitamin D deficiency with increased risk of many chronic diseases including autoimmune diseases, cardiovascular disease, deadly cancers, type II diabetes and infectious diseases.” [2]

[1] Holick MF. Vitamin D: evolutionary, physiological and health perspectives. Curr Drug Targets. 2011 Jan;12(1):4-18.
[2] Holick MF. Vitamin D: a d-lightful solution for health. J Investig Med. 2011 Aug;59(6):872-80.

What are the different forms of vitamin D and why did you select vitamin D3 for EnDuro D?

  • Vitamin D1. In 1919, German researcher Adolf Windaus discovered three forms of vitamin D: D1, D2, and D3. When it was found that D1 was actually a mixture of compounds instead of a pure vitamin D product, the term D1 was dropped.
  • Vitamin D2 (ergocalciferol) is the plant-derived form.
  • Vitamin D3 (cholecalciferol) is the sun-derived form, animal-derived (lanolin) form, and the one we chose for EnDuro D because it effectively raises bodily levels of active vitamin D better than D2.

What makes Endurance C different that other vitamin C products?

There are many reasons!

Endurance C contains two forms of vitamin C:

  • Calcium Ascorbate, known as "neutral C," "buffered C," or "non-acidic C," with a pH of 7.0-7.4. (Unlike "regular" Vitamin C, ascorbic acid, which is highly acidic and may cause gastric distress). While the compound is mostly vitamin C (90%), it also contains a beneficial 92 mg of calcium (10%).
  • Ascorbyl Palmitate is a highly bioavailable, non-acidic, fat-soluble form of Vitamin C that can reach specific tissue areas that standard vitamin C cannot. Thus, ascorbyl palmitate can neutralize specific free radicals that water-soluble vitamin C can't. It also protects against the oxidation of lipids, a broad group of macronutrients that are heavily involved in many essential bodily functions (e.g., hormone regulation, nerve impulse transmission, fat-soluble nutrient transport, and more).


But there's MUCH more than just vitamin C in Endurance C. We've added the following nutrients/compounds, working synergistically to provide a tremendous range of benefits that you don't get in the typical vitamin C supplement:

  • Citrus Bioflavonoids. While not strictly vitamins, bioflavonoids have impressive vitamin-like properties, which is why this group of compounds is known as Vitamin P. Citrus fruits contain several bioflavonoids, such as diosmin and naringin tangeretin, diosmetin, marirutin, neohesperidin, nobiletin, and others. These bioflavonoids work synergistically with vitamin C to support the immune system with antioxidant properties. Citrus bioflavonoids also enhance circulation, reduce aches and soreness, and help support joint health.
  • Hesperidin 95% HPLC is a major bioflavonoid found primarily in lemons, oranges, and tangerines. Hesperidin possesses potent antioxidant properties for supporting vital immune system function, but it can also help blood vessels function better, thus promoting optimal circulatory and cardiovascular health. Additionally, hesperidin helps reduce aches and soreness, supports insulin sensitivity, and may also help protect cognitive health.
  • Quercetin is a highly versatile bioflavonoid obtained from various sources, including citrus fruits, apples, onions, and more. Quercetin has extraordinary antioxidant properties, making it a top nutrient for immune system health. Quercetin possesses properties that strongly reduce aches and soreness, as well as helping to alleviate discomforts associated with allergies. Additionally, quercetin is believed to be highly beneficial for brain and cardiovascular health while also normalizing blood pressure and blood sugar—lastly, quercetin and vitamin C work in tandem in optimizing each other's absorption.
  • Rose Hips (Rosa canina). A natural source of Vitamin C, rose hips are a rich source of antioxidant carotenoids and polyphenols. One of these is tiliroside, which has antioxidant properties assisting non-stimulant fat loss.

Why are nutrients that used to be measured in International Units (IU) now measured in milligrams or micrograms?

Q: Why are nutrients that used to be measured in International Units (IU) now measured in milligrams or micrograms, and what is the difference between these two measurements?

A: International Units (IU) was historically used to measure vitamin A, beta-carotene, vitamin D, and vitamin E. However, the United States Food and Drug Administration (FDA) required that supplement facts labels change IU to metric units, which is why you now see milligrams (mg) or micrograms (mcg).

It’s important to know that even though there is a new standard of measurement, the amounts of the nutrients have not changed in any of the affected Hammer Nutrition products.

Vitamin D – 1 IU = 0.025 mcg
Example: 1 softgel of EnDuro D contains 2,000 IU of vitamin D, now expressed as 50 mcg.

How To Use

EnDuro D
Maintenance dosage – 1 softgel daily.
Acute needs (winter months, low sunlight conditions) – 2–3 softgels daily in divided doses.

Endurance C
Maintenance dosage – 3 capsules with meals daily.
Acute needs (illness) – 3 capsules two or three times daily at the onset of symptoms. Dosage can be increased to bowel tolerance for maximum benefits.

Nutritional Information
Endurance C
Supplement Facts
Serving Size: 3 capsules
Servings Per Container: 30
  Amount Per Serving % Daily Value*
Vitamin C (from Calcium Ascorbate and Ascrobyl Palmitate (Vitamin C Ester)) 800mg 890%
Calcium (from Calcium Ascorbate) 90mg 6%
Citrus Bioflavonoids 600mg
Hesperidin 500mg
Quercetin 180mg
Rose Hip Fruit (Rosa canina) 75mg
* The Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
† Daily Value not established.
Other Ingredients: Dextrin, Vegetable Hypromellose Capsules.

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.
EnDuro D
Supplement Facts
Serving Size: 1 Softgel
Servings Per Container: 30
  Amount Per Serving % Daily Value*
Calories 5  
Cholesterol <5mg <2%
Vitamin D (as cholecalciferol) (2000 IU) 50mcg 250%
Vitamin K from 1680mcg 1400%
K2 as (menaquinone-4 (MK4)) 1500mcg  
K2 as (menaquinone-7 (MK7)) 180mcg  
* The Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
† Daily Value not established.
Other Ingredients: Capsule Shell (gelatin, glycerin, purified water), olive oil.

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.

You have no items in your shopping cart.
Click here to continue shopping.