In 2003, I started supplementing with one a day of Ultra K2 Menatetrenone (MK-4) 15mg (plus 1.5g/day of Ca plus 400mg/day of Mg plus ~1,000iu/day of Vitamin D3) to reverse osteoporosis in my lumbar spine (bone density by DEXA went from -2SD to 0SD) in 3 years. I then used a maintenance dose of 15mg per week (~2,200ug per day). Everything was fine.
At some point, I switched to one a day of Vitacost Ultra Vitamin K with Advanced K2 Complex. Everything was fine.
Around 2012, I switched to one a day of Carlson Labs, Vitamin K2, 5 mg, in order to use-up my remaining iHerb rewards from the use of my discount code NIG935. I'd lost ~$300 of rewards through non-use. Everything was fine - for a while.
In ~2014, my right hip joint, which had previously caused me pain due to iliotibial band impingement on a bony/calcified outgrowth (cured when I began K2 supplementation), began to cause me pain again. As sleeping on my right side worsened the pain, I began to sleep on my left side. My GP felt my right hip joint and declared that there was some "wear & tear" in it and to use topical analgesics. This helped a bit.
In ~2015, my left shoulder joint, which had previously caused me pain due to impingement on a bony/calcified outgrowth (cured when I began K2 supplementation), began to cause me pain again. I assumed that it was "wear & tear", so I put up with it and applied topical analgesics. This helped a bit.
I recently looked-up rotator cuff pain and was perplexed to see that it was usually caused by impingement on a bony/calcified outgrowth. This of course is quite impossible, if taking 5mg/day of K2!
I took a look at the product reviews on iHerb.com, and noticed comments about joint pains from some reviewers, so I ordered a pot of Ultra K2 Menatetrenone (MK-4) 15mg.
Within a week of switching from Carlson Labs to Vitamin Research Products, my joint pains had virtually* all gone.
EDIT: The pain reduction was accompanied by a feeling of great relief and an increased tolerance to loud music & dazzling headlights. I think my cortisol level has dropped.
Therefore, there's something wrong with Carlson Labs, Vitamin K2, 5 mg. DO NOT USE!
*As the rotator cuff is damaged, there will always be some shoulder pain. As a herniated disk in my lumbar spine (before my osteoporosis was reversed) damaged nerves to/from my right leg, I walk lop-sidedly which means that there will always be some hip & knee joint pain.
