Confused about Vit D vs. Vit D-3

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Veteran Member

Date Joined Nov 2009
Total Posts : 7187
   Posted 9/16/2010 9:21 PM (GMT -6)   
In discussions elsewhere, the two terms seem to be used almost interchangeably.
I would like to just get a small amount of a supplement (1000 IU) without doing the blood test. (My doctor suggested I do it without bothering to get the test) Should I get D or D-3?
PSA-- 3/08--2.90; 8/09--4.01; 11/09--4.19 (PSAf: 24%), PCA3 =75 .
Biopsy 11/30/09. Gleason 4+3. Stage: T1C. Current Age: 64
Surgery: Dr. Menon @Ford Hospital, 1/26/10.
Pathology Report: G 4+3. Nodes: Clear. PNI: yes. SVI: No. EPE: yes. Pos. Margin: Yes-- focal-- 1 spot .5mm. 100% continent by 3/10. ED- in progress. First post-op PSA on 3/10/10-: 0.01. PSA on 6/21/10--0.02. Next PSA late Sept.

Steve n Dallas
Veteran Member

Date Joined Mar 2008
Total Posts : 4818
   Posted 9/17/2010 3:47 AM (GMT -6)   
"Vitamin D without a subscript refers to either D2 or D3 or both."
More then you want to know here:

Veteran Member

Date Joined Jan 2010
Total Posts : 1011
   Posted 9/17/2010 4:41 AM (GMT -6)   
Dr Myer recommends D3, but don't ask me why.
Dx with PC Dec 2008 at 56, PSA 3.4

Biopsy: T1c, Geason 7 (3+4) - 8 cores taken with 4 positive for PCa, 30% of all 4 cores.

Robotic Surgery March 2009 Hartford Hospital, Dr Wagner
Pathology Report: T2c, Geason 8, organ confined, negitive margins, lymph nodes negitive - tumor volume 9%
nerves spared, no negitive side effects of surgery

One night in hospital, back to work in 3 weeks

psa Jun 09 <.01
psa Oct 09 <.01
psa Jan 10 .07 re-test one week later .05
psa Mar 10 .28 re-test two weeks later .31
psa May 10 .50

April 10 MRI and Bone Scan show lesion on lower spine, false positive.

Started HT 5/25/10 with 3 month shot of Trelstar. SRT scheduled for late July

psa July 10 <.01 HT at work

howard l
Regular Member

Date Joined Aug 2010
Total Posts : 152
   Posted 9/17/2010 9:25 AM (GMT -6)   
 Vitiman D is found in milk and other foods and is not absorbed into the body very well. D3 is what is found in your skin which is made by sunlight and is absorbed  than the more  easily. D3 is what you want. How much depends on your location and skin type. If you have a darker complexion the more D3 you need. I have herdf up to 40,000 IU per day.
DX age 58
PSA 5.4
Gleason 5+4 = 9
City of Hope Clinical Trial (punch protocol). 6 sessions textore every 3 weeks + lupron
PSA .1
RP Oct 2009. Seminal Invasion positive margins. Lymphnods clear.
1 month PSA post op undetectable.
4 month PSA undetectable.
7 month PSA .5
Bone scan and CT scan negative. Prosticint scan mild activity in prostate bed.
EBRT May 2010. 39 sessions 70gy. On number 37.

Regular Member

Date Joined Mar 2010
Total Posts : 479
   Posted 9/17/2010 10:01 AM (GMT -6)   
D2 is ergocalciferol, a plant based form. This is not the form which is metabolized in the human body to affect bones, general health, etc. You (we) want cholecalciferol, or D3

Veteran Member

Date Joined Nov 2009
Total Posts : 7187
   Posted 9/17/2010 11:10 AM (GMT -6)   

Wow. Someone said 40000IU of D-3.

My doctor just suggested 1000 IU of D.


I'm thinking of doing 1000 units of D-3.

Are the IU of D and D-3 comparable?


Or does 1000 IU of D translate to a higher IU number for D-3.





Veteran Member

Date Joined Dec 2008
Total Posts : 3149
   Posted 9/17/2010 11:19 AM (GMT -6)   
Mel I know I am weird (LOL) but my example of using 6000 units of D3 and achieving a level of 60 ng/ml the average area they mention is useful for us types of patients.
Was a clue, I doubt you are than much different, but you can test for this with OH25 test.

Regular Member

Date Joined Aug 2009
Total Posts : 372
   Posted 9/17/2010 12:15 PM (GMT -6)   
The "Vitamin" in Vitamin D-3 is a misnomer. It's actually a pre, or prohomone that is essential to the whole hormonal system. Most of us are either deficient, or sub-optimal, and need to bomb the system with D-3 supplements to get into the optimal range. So whether you see me taking 50K pill per week, or other guys taking 5000-6000 per day, it's all in an effort to jump start things. Not meant to stay at that intake level once circulating level is achieved.
Google some version of D-3, plug in testosterone, etc., and you'll be amazed at how important this is............of course, 95% of us here are post-treatment, but it's protective benefits in warding off cancer are well documented as well.
Mel, I too think it would be beneficial for you to establish a baseline of D-3 before you take anything. If it's really low, you could be pissing in the wind like I was with 1000 IU perday after having a starting level of 25. Then, whatever approach you decide on, you can monitor so it gets high enough, but not too high that it would become detrimental.
Arnie in DE

Regular Member

Date Joined Aug 2010
Total Posts : 83
   Posted 9/17/2010 12:33 PM (GMT -6)   
<<Dr Myer recommends D3, but don't ask me why>>

Dr. "Snuffy" Myers, in his book "Beating Prostate Cancer: Hormonal Therapy & Diet", states:

(Quote) We live in an age when obesity and the diabetes that follows are increasing at stunning rates. Vitamin D Deficiency exacerbates both. Lack of adequate Vitamin D also increases the risk of hypertension. In turn, high blood pressure, diabetes, and obesity foster the development of heart disease; inadequate vitamin D levels increase the risk of heart attack and congestive heart failure (End Quote)

Dr. Myers goes on to say that he recommends 4000 - 5000 IU daily even though the commonly recommended daily allowance is only 400 (multi-vitamin). Further, he recommends D levels be checked concurrent with other lipid panel reviews such as PSA, dihydrotestorone, etc. every 3 months. Reviews in the 50-100 ng/ml range are the broad 25-hydroxy Vitamin D goals.


Post Edited (Mitch128) : 9/17/2010 12:43:28 PM (GMT-6)

Veteran Member

Date Joined Jul 2009
Total Posts : 504
   Posted 9/19/2010 12:36 PM (GMT -6)   
Without doing a blood test why bother taking anything

Like I said before if you had a blood test and knew your level were 22 taking 1k of D3 may get you to 25 and that does nothing for you, so you are still way short. BUT say your blood test shows 95 then taking 1k gets you over 100 and causes a toxicity problem, then you need blood tests and figure out a way to lower it

Blood test is free, like the Nike add says " Just Do It"

What peace of mind does taking 1k of D3 offer you if you do not know if it is working

Forum Moderator

Date Joined Jan 2010
Total Posts : 6849
   Posted 9/19/2010 1:07 PM (GMT -6)   
The generic Vitamin D - labeled pill I'm taking refers to it being D3 Cholecalciferol 1,000 IU; 250% of the recommended daily value when you look at the facts label. My doctor said it wouldn't hurt (1 a day), but will add the level test for next checkup.
Mr. Gimpy - my insurance (still employed, <65) makes me pay for blood work, so when I get the next round of tests I'll have a $ number for you cry .

Veteran Member

Date Joined Jul 2009
Total Posts : 504
   Posted 9/20/2010 6:28 PM (GMT -6)   
Hi 142,

If your Dr charges more than $65 look here

Hope and Prayer
Regular Member

Date Joined May 2010
Total Posts : 59
   Posted 9/20/2010 9:19 PM (GMT -6)   
Just saw Dr. Myers and he recommended 4000 IU a day of D3.
Boyfriend dx at age 44 with Stage 4 PC on 11/09. Gleason 4+5, 11 of 12 cores +; PSA 51.34
DaVinci surgery on 12/09

Gleason 4+5 confirmed. Lymph and vesicle invasion, right nerves spared.
pT3c N1 Mx
HT: Casedox and Lupron started 1/10

PSA 1/13/10 23.15 2/8/10 .37 3/18/10 <.05 5/14/10 <.02

Bone metastasis

Radiation: 42 sessions ending 6/10
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