50,000 IU's a day would be massive, are you sure you don't mean 5,000 IU? I am going to assume you ment to type 5,000iu. Seriously, if you are taking 50,000 iu a day and your 25OH is that low, you need to seek some medical help.
I had struggled for years with low Vitamin D, my last 25OH vitamin D test was at 70 ng/mL, but it was a journey to get there.
If you want the short answer, I would say, if you are over 40, you need to be taking 10,000iu a day of vitamin D3. Your K2 MK-7 need to then increase to 200 mcg.
I take 2 of these a day: https://www.amazon.c...s/dp/B07255MPRN
The older you get, the harder it gets for Vitamin D to absorb. I helped an 82 year old friend get their D up to 40 ng/mL, it took 15,000iu of the above over 6 months to get her levels up.
Long answer:
#1 Must be vitamin D3 not D2. D3 is 2 times more effective in raising your hydroxyvitamin D blood levels.
https://academic.oup...11/5387/2844259
https://academic.oup...8/4/854/4648650
https://eurekalert.o...s-wha070417.php
https://www.medicaln...articles/318266
https://academic.oup...4/4/694/4633079
https://pubmed.ncbi....h.gov/24001747/
https://pubmed.ncbi....h.gov/21177785/
https://pubmed.ncbi....h.gov/23168298/
#2 Has Vitamin K2 MK-7. Specifically I looked for a product that that Natural MenaQ7 (https://menaq7.com/, I found the Sports Research D3+K7 product off of MenaQ7’s website of products that carry it). You MUST have vitamin K2 in order to absorb Vitamin D. Vitamin D without K2 is worthless. On top of this K2 comes in MK-4 and MK-7. MK-7 better absorbs than Mk-4 and MK-7 stays in your body much longer. Both MK-4 and MK-7 are found in the body naturally. Both can be synthetic, however MK-4 is more likely to be synthetic than MK-7. So I had to find a Natural MK-7 which MenaQ7 delivered! (https://menaq7.com/w...naq7/varieties/)
https://pubmed.ncbi....h.gov/29138634/
https://www.mdpi.com...-6643/9/12/1334
https://www.ncbi.nlm...les/PMC5613455/
https://pubmed.ncbi....h.gov/26295257/
https://pubmed.ncbi....h.gov/19386744/
https://pubmed.ncbi....h.gov/15514282/
https://pubmed.ncbi....h.gov/18722618/
https://pubmed.ncbi....h.gov/25694037/
https://www.scienced...014299915300777 “Menaquinone-7 appears to offer a number of practical benefits over menaquinone-4 in terms of lower dosing and single daily dosing instead of multiple doses.”
https://ashpublicati...ary-supplements
#3 Vitamin D and Vitamin K are fat-soluble vitamins. You need to take them in fat. Sports research uses Organic Coconut Oil to achieve this.
https://www.webmd.co...ferent-vitamins
https://pubmed.ncbi....h.gov/20200983/ taking vitamin D with the largest meal of the day increased vitamin D blood levels by about 50% after just 2–3 months
https://pubmed.ncbi....h.gov/25441954/ consuming vitamin D alongside a fat-heavy meal increased vitamin D blood levels by 32% after 12 hours compared to a fat-free meal
https://www.scienced...212267214014683
#4 you can Overdose on Vitamin D and it can become toxic, however those levels are pretty high.
https://www.mayoclin...(15)00244-X/pdf
https://vitamindwiki...ty of vitamin D
Hope that helps.
Edited by coinperson, 07 August 2021 - 02:09 PM.