As human beings, our lifestyles have changed from that of barely-clothed, nearly naked hunter-gatherers spending most of our daylight time outdoors, to fully clothed, smothered in sunscreen, and spending very little time outdoors. This effectively stops our skin from assimilating Vit D from sunlight, which is our primary source of this pro-hormone. No wonder we have so many health epidemics and pandemics, particularly the degenerative diseases and cancers. The immune stimulating effects of D3 - and it MUST be the "3" form, which is cholecalciferol, from animal sources, and not ergocalciferol, which is D2, and from plant sources - are monumental. Be wary of studies that claim vit D supplementation has no effect on bone density or other issues - check that they have used a decent amount (a lot of studies only use 400 or 800IU, and of courser that won't show any beneficial effect because it isn't enough), and that the form was D3 and not D2. Check out potential toxicity issues for yourself. Some people who say they tried vit D and got bone spurs and other calcium deposition problems as a result experienced that because they did not observe some simple facts: Vit D needs Vit K to direct the calcium into the bones - without that process happening, the calcium will OF COURSE get dumped willy-nilly by the body. You can think of Vit K like a mini-bus, picking up the workers and driving then to the job-site. Unless K is there to pick the calcium up, the calcium just wanders around until it lands somewhere and stays there. This is also why some people get kidney stones on high dose D. Other bone factors have to be considered too - estrogen and progesterone are critical to bone health - they produce osteoclasts, which clear away old bone cells, and osteoblasts, which build new bone. You cannot build new bone until the dead stuff has been cleared away, in the same way that you couldn't build a safe new building directly on top of a derelict building with wonky foundations. Other minerals are also important. The calcium:magnesium ratio is especially crucial to get right, and this is going to vary from person to person, with some health conditions benefitting from way more magnesium than calcium. An easy way to check that you are taking enough magnesium is to observe the standard natural medicine protocol of observing any sudden change in stool texture. When you have taken as much mag as your body can use that day, you experience what I can "torpedo poos", which is to say that they pop out quite fast, and are very smooth (not the ideal stool as it indicates food has passed through too fast for optimal absorbtion, but a good way to check you mag requirement). Silica is very important too, because part of bone health is flexibility of the tissue. According to some studies and claims, only 10% of bone structure is actually calcium, the rest is collagen, which is the same springy stuff that gives our skin (and blood vessels and other connective tissues like cartilage, tendon, etc etc) its elasticity. Silica, it is claimed, is as important as Vit K in directing calcium away from soft tissues and into bone. The idea is that the bones are where the body is designed to store calcium so that it can be pulled out of the bones and into the blood as needed - blood levels are kept within very very narrow margins, and any deviation from these margins disrupts health in a major way. So, according to something I read on Eidon's website, only 10% of bone is made of calcium, but bone is the storage depot for calcium. And calcium needs silica as well as Vit D3, Vit K (the MK7 lasts twice as long in the body than the ordinary K2), phosphorous (very plentiful in diet and prob no need to supplement), magnesium, estrogen (definitely in women, I haven't checked to see about men, but presumably they also have the same mechanism of action for osteoblasts and osteoclasts, and contrary to popular belief, men DO produce estrogen, just like women produce testosterone, we each just produce the others major sex hormone in smaller amounts than the opposite sex does), progesterone...........I know some people without osteoporosis and otherwise healthy (I have osteoporosis, breast cancer, fibromyalgia, low adrenal and thyroid function, and other issues) have successfully added high dose D 10k IU/day along with K2, and haven't needed to address other more extensive bone health issues, but please be aware of all these different factors before leaping in without thinking about adding silica and the others. Oh, before I forget, another thing to investigate is Vitamin A, currently a bit out of favour, but think about it - in cod liver oil, which occurs naturally, and indeed used to be prescribed by the government for pregnant women in the UK, and was also prescribed by the government here in war time when we spent a lot of time underground to escape the bombs, levels of Vit A are HIGHER than Vit D. Maybe once D levels have been brought up to optimal status, at which point you can determine your ongoing maintainance dose (which will be lower than you repletion dose), Vit A then needs to be adjusted according to this principle. M Aziz's book is a brilliant source of info, and contains a huge amount of medical references that you can go and check for yourself. It is his personal account of helping himself and his family with high dose D3. He has been taking 10K-12500 IU a day for the past 6-8 years, with nothing but beneficial effects. His bone density has increased. He takes no supplemental calcium or magnesium or progesterone or estrogen, nor silica, just MK7 K2. Also, it is obviously vital to get our GP onside and to have your D levels checked before and during supplementation. Just use you own knowledge of what the test SHOULD say in order for you to be optimal, rather than what the reference ranges on the tests say - they differ wildly from lab to lab, hospital to hospital, so draw your own conclusions. Hope this helps - read M Aziz's book it's a really exciting eye-opener. Currently an e book from the biggest online bookseller.
Posted by iHerb Customer on Apr 22, 2014 | Verified Purchase
I've been using this for just over 6 months now. What I have noticed is that my skin appears to be much smoother than before (though I observed this approximately 2 months ago). Other than that... my partner was on it for the last month or so. I've been giving him roughly 2 capsules per day (along with Vitamin K2 as MK-7). He noticed that he doesn't get tired as often as before, and that his skin also appears to be more smooth than before (I gave him 10 capsules for about 8 days in a row because I read that each 10 000 IU equals 1 ng/mL... so I wanted to raise his levels quite fast). Right now I've lowered his dosage to 10 000 IU daily, although I think I can reduce it further to 40 000 IU per week for maintenance purposes. My dose is currently at maintenance levels (4 capsules per week) because I've been on this for the last 6 months already. We hadn't had a chance to test our Vitamin D3 levels yet at all... but both of us are not exactly in the sun to begin with, and since we are in Scotland, the sun here appears in full force on a rare basis. I actually had a pretty good idea that both of us were quite deficient in D3 (especially me). Plus, I also noticed that I've been feeling healthier overall since taking it. I think this product is great... but I wouldn't mind iHerb offering Vitamin K2 as MK7 (100 mcg) along with D3 10 000 IU both in 1 capsule. Packing these potencies and forms together would be pretty great and likely lower the overall costs in the long term.
Posted by iHerb Customer on Dec 20, 2010 | Verified Purchase
i don't get enough sun so i take D3. it's suspended in olive oil, nice. (some other more $$$$ brands use inferior vegetable (omega-6) oils. my cold got so much shorter this winter.
Posted by iHerb Customer on Aug 08, 2010 | Verified Purchase
Fresh and excellent value.
Posted by iHerb Customer on Feb 07, 2010 | Verified Purchase
This level of vitamin D really lives up to what it is suppose to do. Within 3-4 days of starting this. I began to have really good feelings of well being.
Posted by iHerb Customer on Apr 02, 2010 | Verified Purchase
I take these myself and I read a study from Canada about Vit. D3 and breast cancer so I sent my daughter a bottle as she has breast cancer and asked her to take 3 to 5 a day and she tells me that she is feeling better but has had no scans as of yet to determine any effect.I like being able to buy the 10,000 IU instead of taking so many.
Posted by iHerb Customer on Feb 10, 2010 | Verified Purchase
I made an order to Europe. Order came swiftly in about a week. Product is just how I it wanted. Strong, pure D- vitamin.
Posted by iHerb Customer on Dec 27, 2017 | Verified Purchase
I waited for a while to write a review because I wanted to make an honest and thorough review. Excellent dose in a small, easy-to-swallow capsule. 10000 international units of vitamin D3 - the maximum permissible dose per day that can be taken during the year without the danger of overdose. A good price to supply an adult for 1 year. This is the most economical packaging combined with excellent product quality. A very important vitamin for everyone, especially for those who live in the north. Vitamin D3 is safe, even when given as a supplement because it is a natural / vitamin hormone that the body recognizes. I have read more debates - whether to take it at night or during the day. I decided to try at night first. I slept so well as a child and I woke up so fresh! Also, my mood has improved and there is no feeling of weakness in the morning. Vitamin D3 makes me feel a lot better. I've noticed an improvement in good mood and overall metabolism. Since I started taking it, I feel very energetic and strong. I take vitamin D3 together with vitamin K2 (it is very important for the high dose of vitamin D3). It has improved my mood, mood, hair, nails and skin. It also helps depression, reduces the risk of heart disease, multiple sclerosis. It has a positive effect on the thyroid and adrenal glands, reduces the risk of colon cancer and breast cancer. Beware, do not be fooled by the daily dose recommended by the pharmaceutical industry (the "disease industry"), which is 400 international units. Definitely a very small dose! The pharmaceutical industry does not want to do well, but to become an eternal customer.
Posted by iHerb Customer on Nov 30, 2017 | Verified Purchase
I really like the size and potency of this. The capsules are easy to swallow and last a long time. A great buy in my opinion.
Posted by iHerb Customer on Aug 15, 2017 | Verified Purchase
I've been using D3 for years now and take at least 30,000 IU a day along with Vitamin K2 ( very important for high dose Vitamin D3 ). It's hard to find the higher strengths where I live. These caps are small and easy to take. The price is amazing and the speed to Australia incredible. Great product! Thankyou.
Posted by iHerb Customer on Jan 16, 2017 | Verified Purchase
Taking one of these a day my level increased to 63ng/ml in two months. So it works well.