Vitamin D (Calciferol) is frequently used in rat poison and very toxic when consumed by cats and dogs: Pet Poison Helpline
This is one of the most dangerous mouse and rat poisons on the market and unfortunately, seems to be gaining in popularity. Cholecalciferol, or activated vitamin D3, causes a life-threateningly high calcium and phosphorus level in the body, resulting in severe, acute kidney failure. This can progress to chronic kidney failure and have long-term repercussions.
Vitamin D seems to be beneficial if consumed by humans according to some sources: Wikipedia
Shane Ellison, who calls himself "The People's Chemist", says Vitamin D toxicity builds up in the body and will eventually kill a human the same way a rat is killed when consuming it:
Nutritionists are unaware. Male cheerleader turned nutrition guru, Johnny Bowden (Whoops, I spelled his name wrong.), proves it. Vitamin D pills are his crown jewels, and he likes “bromancing the Dr. Cannell stone.” He often uses statistical contortionism to push it as a non-toxic cure-all, akin to water! He doesn’t understand that, unlike water, it’ s a “cumulative poison;” meaning that it’s absorbed by fat cells and festers internally for months. It’s called bio-accumulation. And that’s where small, daily ingestion becomes dangerous, the repeated use over time gives way to side effects – death in slow motion. Water on the other hand gets passed through readily after used, and doesn’t snuggle into the far away corners of our fat cells.
The “rickets rationale” for supporting the use of synthetic vitamin D is the most frustrating. It purports that “vitamin D” cured the paralyzing disease, which is prima facie evidence of its healing qualities. Not true. The plethora of “sunshine hormones” produced by the skin, and those found naturally in cod liver oil, cured rickets, not vitamin D pills made in the stinky labs of Big Pharma. Purveyors of this myth have the Big Pharma marketing noose firmly around their neck, and probably don’t even know it.
If the rickets rationale didn’t win you over, the “cancer cure con” probably did. You’ve seen it plastered on the headlines of every paper in the U.S and even on well known, natural health websites: Vitamin D fights cancer. The redundancy itself should be your first clue that “something fishy” is going on. The anti-cancer statements come direct from short term trials performed by “advisors” to Big Pharma and published in the top nutrition journals! Worse, the trials only show a small statistical association of low cancer rates among vitamin D users over about a 5 year period. This is plain silly.
Cancer takes more than 5 years to develop. Even heavy smokers can survive 5 years without a cancer diagnosis, but we know cigarettes are a real threat. Thus, any study on cancer lasting five years has very little value. This same scheme was used by the cigarette industry to erroneously thwart off the cancer claims in the early 1970’s. Now it’s being used to pretend vitamin D staves off cancer. It’s a con, and long term vitamin D studies (which are being ignored) show just the opposite (just like they did with cigarettes, of course). In conclusion, I’m sounding the alarm that a slow vitamin D poisoning is happening worldwide. Vitamin D supplements and fortified foods are attacking the body from numerous sources, where it’s behaving like the rat poison it is. You choose, sunshine or vitamin D pills (D2, D3 or otherwise)?
Wikipedia on supplementation:
Supplements The effects of vitamin D supplementation on health are uncertain. A United States Institute of Medicine, (IOM) report states: "Outcomes related to cancer, cardiovascular disease and hypertension, diabetes and metabolic syndrome, falls and physical performance, immune functioning and autoimmune disorders, infections, neuropsychological functioning, and preeclampsia could not be linked reliably with calcium or vitamin D intake and were often conflicting.":5 Some researchers claim the IOM was too definitive in its recommendations and made a mathematical mistake when calculating the blood level of vitamin D associated with bone health. Members of the IOM panel maintain that they used a "standard procedure for dietary recommendations" and that the report is solidly based on the data. Research on vitamin D supplements, including large scale clinical trials, is continuing Maxmen A (2011). "Nutrition advice: the vitamin D-lemma". Nature 475 (7354): 23–5. doi:10.1038/475023a. PMID 21734684.
So are vitamin D pills safe in the long run?
You choose, sunshine or vitamin D pills- I'm skeptical of this argument: because sunshine itself is carcinogenic; because many people don't get much sunshine (or of the "cod liver oil" he quoted as another alternative); because vitamin D is prescribed more for bone health than for cancer; and because everything is poisonous, and what matters is the balance, i.e. whether the quantities involved do more good (e.g., better long-term bone health) than harm (e.g., increased long-term cancer rates).