Get your D3 blood levels checked.

i take 5000iu daily, and some days i take 10,000, although I will stop taking the second one now that I can get some regular sun. I have noticed no ill effects in the slightest, even taking the first 5000 on an empty stomach in the morning. But I also take Magnesium 3 or 4 days per week too. A friend here at work says if he takes one of his 2000iu D on an empty stomach he gets diareah, but thats the only ill I have heard of with it.

I realize this post is ancient, but I have experienced this as well.

Is it a warm, sometimes burning sensation, with a dull ache, around the kidneys? Then it's probably the vitamin D.

But before you stop taking it (I sure wouldn't), do your homework. Get your serum 25(OH)D checked, and for god's sake make sure you are getting sufficient calcium and magnesium. After this first happened to me, I panicked, stopped the vitamin D and ended up deficient (21 ng/mL, 50 nmol/L) with surprising rapidity. That caused further kidney pain that was a whole lot worse, let me tell you.

If you are worried, let the lab work tell the story. In my case, there was no indication of any of the bugaboos of vitamin D supplementation: my 25(OH)D levels were well within the normal range (a peak of 66 ng/mL), calcium, magnesium and phosphate were all dead normal, creatinine and GFR were normal, and an ultrasound of the kidney turned up nothing. I also didn't have any pain on urination. I think my doctor was bemused at my panic reaction. Surprising, especially given that he'd never heard of anybody taking 5000 IU cholecalciferol a day before I came to him. The point it is, this stuff is a lot safer than it is made out to be.

I've since figured out that it responds to adequate calcium and magnesium intake.

One of the challenges of paleo nutrition is getting enough calcium. You need to eat a lot of vegetables (like broccoli, for example), and just securing and preparing the amount needed could turn into a full time job. You might try eating sardines or salmon with bones and skin. Nuts are also a good source.

Beyond that, calcium, magnesium and vitamin D are among the few things I supplement, because they have helped me so much.

I have been supplementing with Now Brand 5000IU per day for 3 years to keep my level in the mid 80s ng/ml with absolutely no problems.

Sounds as if you have a strain that you need to heal. The Vit D3 is not the cause.

You do want to take D3 in the morning as it can affect sleep patterns.

Get your serum calcium checked. Sometimes repleting D can unmask hyperparathyroidism. Symptoms can include fatigue, irritability, bone pain, and kidney stones.

I have been taking 50,000IU vitamin D pills one per week for the last 3 weeks. I too am beginning to feel a soreness across my lower back where my kidneys are. I didn't have this soreness before I started the treatment. I wonder if I am taking too much. I have just one more pill to take, so I am going to hold off taking it this week since I am going to Miami tomorrow, I will be able to get some direct sunlight.

Hi -- I've been taking vitamin d to correct a deficiency and secondary hyperparathyroidism and have also noticed kidney pain. I take low doses (~1600 iu/day) but it's been bothering my kidneys pretty substantially. I haven't taken any d in 2 days and my back/kidney area feels much better. Can't tell me they aren't related. I KNOW they are. Don't know the answer though except -- not take as much. Apparently as we age, absorbing vitamin d gets more difficult.

I agree with Dexter, I think it's your burpees and kettlebells that are giving you that pain. Those will definitely strengthen muscles you didn't even know you had. I've been taking 5000-10000 iu for several months and I've never had any ill effects.

I took a vitamin D supplement for the first time (only 4000IU) and later that night I had terrible back pain around the area of each kidney. I later vomited several times. Probably coincidental but it made me wonder enough to do a Google search and I would up here.

I always notice kidney soreness when I start up on any new aggressive supplement regime. I've always (foolishly!?) regarded it as normal, and it tends to dissipate within a day or two. I always take a few tablets of Cranactin (a vitamin C tablet purported to aid kidney and bladder function) a day when this happens, just in case (: I'm always paranoid because I've suffered from 1-2 UTIs-cum-bladder infections per year since I was 12 (haven't had one since January though, yay!). Even if it doesn't do much to help, it doesn't hurt!

Of course, if the pain is unbearable, worsens or doesn't go away even if you cease the D supplementation, definitely see a doctor!

I never noticed any pain and I started vitamin D 5000iu's from 0 about a year ago. I'd definetely attribute it to the training, especially since you were already taking 2000iu a day.

I have also noticed a signifigant amount of kidney pain, and it seems just since I started on a 4000 IU dose of vitamin D3. I have had several bouts of blood in urine and kidney stones. Never really connected the two until now ! I will lay off the vitamin D3 and see what happens....... Will let you know in a few weeks if anything has changed.

I've been having intermittent kidney pain and recently lower back and leg pain. I have arthritis and thought the pain was due to this but this pain is very different. It is more neuropathic and recently also started having muscle spasms. I take vit d 10,000Units about 3 times per week and I really think this is the cause. Now I'm seeing this online on various sites and the symptoms remind me of my own. One site said to keep taking the D because the pain is telling you you're deficient. Also I've seen that it could be linked to magnesium deficiency r/t taking the D. All interesting and I'm unsure what I should do. I just know I can't take the pain any more.

Vitamin D can cause pain in the kidneys and too much can cause problems. Too much vitamin D can place a strain on these organs and may provoke kidney stones. On the other hand, vitamin D deficiency is associated with chronic kidney disease and doctors use vitamin D supplements to treat the disease...