A found some information which may be of interest to anyone here who is taking vitamin D supplements.
First I noticed the passage here:
When the parathyroid hormone or a or a toxic form of vitamin D is given to young rats, calcium is withdrawn from the bones, simulating the withdrawal of calcium during stress, and advanced old age is produced, including wrinkles, squeaky voices, cataracts, and shriveled sex glands.27 If the soft tissues are harmed in any way, the calcium withdrawn from the bones is laid down in the damaged area.
Davis, Adelle. Let’s Get Well: Adelle Davis has sold over 10 Million Books (pp. 116-117). Adelle Davis Foundation. Kindle Edition.
wondering what this toxic vitamin D was I searched further in the same book and found this:
Vitamin D, however, is essential before the kidney tubules can reabsorb calcium efficiently. If this vitamin is undersupplied, as it frequently is in stone-formers, large amounts of both calcium and phosphorus are excreted in the urine.24 Excessive synthetic vitamin D, or irradiated ergosterol, such as 5,000 to 25,000 units daily, likewise causes a heavy loss of these minerals.24–26
Davis, Adelle. Let’s Get Well: Adelle Davis has sold over 10 Million Books (p. 215). Adelle Davis Foundation. Kindle Edition.
Since both mentioned the withdrawal of calcium I wondered if the toxic vitamin D was the synthetic form. This led me to find this page which you might be best to read in full.
As it is mid winter now in Australia, this has led me to throw out my vitamin D supplements and go back to good old codliver oil. If not conclusive, irradiated lanolin sounds pretty disgusting IMHO.
The Price Potteger foundation also claims that codliver oil on its own is not nearly as effective as when taken together with butter made in summer or autumn. This is old research and they did not know what was in the butter and called it something like factor x. It has since been discovered that this is vitamin K2. Because of this I also take vitamin K2 every morning and the codliver oil in the middle of the day.