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Becky · 07-11-2009, 02:14 PM

As we age, it is not that Vitamin D3 is quickly absorbed but in a strange way, it is the opposite. It is not vitamin D3 that the body uses. We injest (or have sunshine on our skin) and the vitamin3 D is converted first by the liver to 25 hydroxyvitamin D3. After that, this is converted to its useable form in the body by the kidneys to 1,25-dihydroxyvitamin D3. It is this substance (I'll call it 1,25 that the blood tests measure because it is what is the true useable form. As we age, the liver and kidneys get less efficient at the conversions therefore, before it is converted we wash it out of our systems (either the Vitamin D3 or the first conversion component).

So that the metabolism of this yummy. Go figure - isn't the human body and its chemistry utterly amazing.

07-11-2009, 02:14 PM	#6
Becky Senior Member Join Date: Sep 2005 Location: Stockton, NJ Posts: 4,179	Andi BB As we age, it is not that Vitamin D3 is quickly absorbed but in a strange way, it is the opposite. It is not vitamin D3 that the body uses. We injest (or have sunshine on our skin) and the vitamin3 D is converted first by the liver to 25 hydroxyvitamin D3. After that, this is converted to its useable form in the body by the kidneys to 1,25-dihydroxyvitamin D3. It is this substance (I'll call it 1,25 that the blood tests measure because it is what is the true useable form. As we age, the liver and kidneys get less efficient at the conversions therefore, before it is converted we wash it out of our systems (either the Vitamin D3 or the first conversion component). So that the metabolism of this yummy. Go figure - isn't the human body and its chemistry utterly amazing. __________________ Kind regards Becky Found lump via BSE Diagnosed 8/04 at age 45 1.9cm tumor, ER+PR-, Her2 3+(rt side) 2 micromets to sentinel node Stage 2A left 3mm DCIS - low grade ER+PR+Her2 neg lumpectomies 9/7/04 4DD AC followed by 4 DD taxol Used Leukine instead of Neulasta 35 rads on right side only 4/05 started Tamoxifen Started Herceptin 4 months after last Taxol due to trial results and 2005 ASCO meeting & recommendations Oophorectomy 8/05 Started Arimidex 9/05 Finished Herceptin (16 months) 9/06 Arimidex Only Prolia every 6 months for osteopenia NED 18 years! Said Christopher Robin to Pooh: "You must remember this: You're braver than you believe and stronger than you seem and smarter than you think"