Update: This popular deal is still available.
Sports Research via Amazon has
60-Count Sports Research Vegan D3 5000 IU + K2 100mg Softgels on sale for $23.95 - 40% when you clip the coupon on the product page - 10% when you check out via Subscribe & Save =
$11.97.
Shipping is free with Prime or $35+ orders.
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Navy-Wife for finding this deal.
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Top Comments
Even the regular in-store price is better than this (5.7 doses per dollar vs 5.57 assuming S+S).
Compared to the online Costco price, this is a better deal.
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Our community has rated this post as helpful. If you agree, why not thank Bballer02
K2 is important with D3. Highly suggest it to everyone. This is at the proper ratio I believe as well. (some supplements are not)
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10,000 IU of D3 is basically 250 micrograms. K2 is already potent at low doses, so unless you have some kind of deficiency, I'm not sure why you'd ever need to be dosing like 400mcg.
Also, D3 ≠ calcium. It just helps your body absorb it. Most blood tests (CBC + D panel) can show if you're low on Vitamin D, but there's not really a common test for K2. That said, you can be low in it, signs show up over time like chronic tooth decay, weak bones, or even calcium building up where it shouldn't (like in arteries).
D3 and K2 basically work as a tag team:
D3 helps absorb calcium
K2 helps guide it where it's supposed to go (bones/teeth), instead of where it shouldn't (arteries/organs)
TLDR:
If you've got symptoms of low D, get tested. K2's harder to test for but worth looking into if you're on high-dose D3 or have bone/teeth issues.
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Things to know:
1. Vitamin D metabolism in the body is complex. Without serum testing there is no way to predict if your body is efficient or inefficient at absorbing and metabolizing oral D3 or what level is appropriate for you.
2. There is a wide variation among people on absorption and metabolism to reach optimal serum levels of 25(OH)D. Some individuals have chronic insufficiency as a result of medical conditions while others may exceed safe serum levels with lower levels of supplementation resulting in toxicity, Therefore it is important to know where you stand in the bell curve and what your individual needs are for supplementation.
2. While the debate continues in the research community medically established ranges for the serum test are: Vitamin D insufficiency is generally defined as having blood levels of 25-hydroxyvitamin D between 21-29 ng/mL, while deficiency is typically below 20 ng/mL.
3. Optimal levels of 25-hydroxyvitamin D (25(OH)D), a measure of vitamin D in the body, are generally considered to be between 75-100 nmol/L (30-40 ng/mL) for most health endpoints, though some recommend levels up to 125 nmol/L (50 ng/mL). .
4. Exceeding 70 ng/mL ( some research suggests 100 ) serum level increases the risk of toxicity.
5. The form matters. Some individuals can't achieve serum sufficiency no matter how much D2 they take. D3 cholecalciferol from lanolin is effective for most. YMMV. Is the Sports Research Vegan form superior? You decide.
6. Quality matters. As a chronically insufficient individual under the care of an MD most supplements labeled as 5,000 I.U. D3 had no effect in raising my serum level. The larger the capsule the more garbage inside.
"D3-5" dry powder in tiny capsules from Bio-Tech Pharmecal is a gold standard used in research studies and cost me $5 per 100 caps when ordered through my pharmacist. YMMV.
7. K2 supplement is far more expensive than D3. Many choose natural sources of Vitamin K instead such as green juice.
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