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.

Yes, every Hammer Nutrition supplement is 3rd party tested in compliance with the FDA’s regulations, 21 CFR Part 111 – Dietary Supplements. All the raw materials for each supplement we produce are tested for purity, strength, identity, and integrity. In addition to raw material testing, every Hammer Nutrition supplement is also tested in every stage of production—blending, encapsulation / powder-filling, packaging components and finished goods—before being released for distribution.

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.

2000 IU (50mcg), the amount of vitamin D3 found in one soft gel capsule of EnDuro D, is the amount that Dr. Michael Holick—considered to be the preeminent expert on vitamin D supplementation—generally recommends. He discusses this dosage in his book, The Vitamin D Solution: A 3-Step Strategy to Cure Our Most Common Health Problems, as well as in numerous interviews.

There is a total of 1,680 mcg of vitamin K2 in one soft gel capsule of EnDuro D, split between the two most-studied subtypes of vitamin K2, Menaquinone 4 (MK-4) at 1500 mcg and Menaquinone 7 (MK-7) at 180 mcg. While an extremely high pharmacological dose of 45 mg (45,000 mcg) of MK-4 has been used for the treatment of osteoporosis in Japan, research (https://pubmed.ncbi.nlm.nih.gov/23702931/ and https://pubmed.ncbi.nlm.nih.gov/19352059/) has shown that a lower amount of 1.5 mg (1,500 mcg) is effective. Research (https://pubmed.ncbi.nlm.nih.gov/23525894/) on MK-7 has shown that 180 mcg/day is effective. Additionally, Dr. Dennis Goodman, author of Vitamin K2: The Missing Nutrient for Heart and Bone Health, suggests amounts between 150 to 180 mcg/day of MK-7.

Yes, among their many benefits, both of these important nutrients play key roles in managing calcium. Vitamin D helps ensure that calcium is efficiently and optimally absorbed, and Vitamin K helps keep calcium out of the arteries where it doesn’t belong, thus helping protect against heart disease. Vitamin K activates the calcium-binding actions of two proteins—matrix GLA protein and osteocalcin—which help to strengthen bones and teeth.

High doses of oral vitamin K2 are not associated with adverse effects, and studies have found no toxicity even at very high levels. For example, an acute oral toxicity test used 5,000,000 mcg of vitamin K2, and even at that extreme dose, none of the test rats died or exhibited toxic effects). As a result, the U.S. Food and Nutrition Board has not set an upper intake level for vitamin K due to its extremely low toxicity. See https://www.nature.com/articles/s41598-024-56151-w# for more information.

Yes, shake well before using this product.

Yes. Every Hammer Nutrition product we sell comes straight from Hammer Nutrition USA, based in Whitefish, Montana. We are Hammer Nutrition Philippines, the official distributor of Hammer Nutrition in the Philippines, and we import directly from Hammer Nutrition USA. You can buy from us here on hammernutrition.ph, from our official Lazada and Shopee stores, or from the authorised dealers listed on our Dealer Locator.

It depends on the batch we have in stock. Right now most of our stock has at least a year left, and many items have 2 to 4 years, with expiry dates running up to 2031. Hammer Nutrition supplements also show a manufacture (MFG) date on the label. If you need a specific expiry date, message us by email at sales@hammernutrition.ph or on Viber before you order and we will check it for you. We update this FAQ as new stock arrives.