Many studies. This is one: sciencedirect.com/science/a...
I must point out that not every study comes to a positive conclusion. I have seen many positive studies and some neutrals. I don't recall seeing a negative.
So, I would assume a meta-analysis would show a positive bias.
As we get into winter, maintaining adequate Vitamin D becomes harder. In the US, low Vitamin D is rarely an issue because dairy products are fortified.
So many of us are anti-dairy. I will stick with supplements.
Get tested to be sure you need it.
I did thanks. I have been low most of my life. One time a Dr said if I was a kid I would have rickets.
The studies I’ve read Show a negative bias for prostate cancer patients when vitamin D levels are extraordinarily high or low. Would you agree 30 to 50 is kind of a good zone to shoot for?
Everyone needs to watch the units, in the US the units are ng/ml but in many other countries, the measurement units are typically nmol/l. Convert by dividing nmol/l by 2.496.
So for example
125 nmol/l = 125/2.496 ng/ml = 50 ng/ml
I agree with your range. A conservative target is 30-50 ng/ml. I do SPT (high testosterone). Vitamin D plays into that. I'm looking into it because I don't know exactly how. Perhaps vitamin D targets can be higher on SPT. A couple of guys on this site who have been doing BAT and/or SPT for years are using higher levels. They're beating the odds so I'm trying to figure out what they do and why. Always learning...
But for most I think 30-50 is a good target. I measured my PSA when my vitamin D level was 47 ng/ml and am now doing a test of high vitamin D (I'm taking a large dose every day). I'm going to measure my 25-hydroxy and my PSA after one month of high vitamin D. If my PSA is unchanged I plan on one month of high vitamin D every year. If it's lower I'll continue high vitamin D and monitor my PSA. I also plan on talking to my MO. She'll have to go by the SOC line but I can usually get a read for what she really thinks.
I very much agree. No higher or lower than normal.
All depends on your targeted range
It's fortified but for vegans, it can be hard to get. I'm vegan and don't eat most of the vegan food sources of vitamin D. So I have to supplement and I also try to get out in the sun every day.
In most places, it becomes harder to get sunshine in the winter. I live in Phoenix and it's the opposite (too hot to stay out long in the summer).
Ironically, northern European countries have higher serum Vitamin D levels because they supplement, whereas in southern Europe they relied on sunshine. When forced indoors, they actually had lower levels than those in northern Europe. It is always a good idea to get a serum Vitamin D test and not guess.
Hey T_A!
Going back a few years it was suggested that the reason why those in the Nordic countries supplement.
Effects of a healthy Nordic diet on plasma 25 ...
ncbi.nlm.nih.gov/pubmed/245...
CONCLUSION: Consuming a healthy Nordic diet based on NNR increased vitamin D intake but not plasma 25 (OH)D concentration. The reason why fish consumption did not improve vitamin D status might be that many fish are farmed and might contain little vitamin D or that frying fish may result in vitamin D extraction
There seems to be a loss of-- or even negative nutritional changes in factory farmed animals, fish and fowl. It isn't only the stress they live under, lack of exercise but also the "manufactured" or altered foods they are fed.
An example of feeding "livestock" food manufactured from the discarded body parts of other animals was in the UK that surfaced in the 1980's. It is an organism not on the level of a bacteria or even a virus but is a --proteinaceous infectious particle--rolls nicely off the tongue--right. Just keep it away from you tongue! That long moniker has been shortened to "prion".
About CJD and Prion Disease | Creutzfeldt-Jakob Disease ...
In the US of A people living in southern regions are more apt to be infected because of long held lifestyles.
Creutzfeldt-Jakob Disease and eating squirrel brains - The ...
thelancet.com/journals/lanc......
Creutzfeldt-Jakob disease: possible transmission to humans by consumption of wild animal brains. A new variant of Creutzffeldt-Jakob disease in the UK. led us to examine the possible association of eating squirrel brains with CJD in rural Kentucky, where eating squirrel and other small game is not uncommon.
Back to fish--
Farm Raised Fish Shocking Nutrition Facts: Tilapia and Salmon
naturallivingfamily.com/far...
Dec 08, 2017 · Farmed fish like salmon are fed contaminated food from a global supply of fishmeal that is full of PCBs.
We know about poultry and eggs right? McDonald's is in the process of switching to eggs from cage free hens because of public pressure.
McDonald’s Farmers: Cage-Free Eggs | McDonald’s Newsroom
news.mcdonalds.com/stories/...
Apr 11, 2019 · McDonald’s USA is making significant progress towards our commitment to source 100% cage-free eggs by 2025. Our egg supply chain is now 43% cage-free. In 2019, we sourced more than 949 million cage-free eggs for our McDonald’s U.S. restaurants. Meet The Forsmans, a 4th generation family egg farm, working hard to help make this change.
We are what we eat has eaten and the way it has lived also has an effect on nutritional content and quality--or for vegetation--the way it was grown.
Your advice about testing for vitamin D levels should be followed. There is a balance, parameters to stay within.
The more we play with our food supply--just remember--$$ drives the manipulation of farmed and wild caught foods.
Currumpaw
True that! A test gives you more insight. Inexpensive and simple. I don't like guessing at this. Monitor and test as much as my wallet allows 
Yes. RSH1. I have read several studies which point out risk of severe Covid19 dramatically lower in people who have Vit D levels above 40.
My level in Feb2019 when Covid 19 started in USA was only 21. With 5000 IU every day plus Sunbathing, for last 7 months, Vit D level has come up and is 54 now. I take SR brand plant based Vit D3 PLUS K2 softgel caps.
My cardiologist told me that she knows of several doctors that regularly come into contact with Covid patients who take vitamin D and Zinc supplements for immune support. That was good enough for me so now those are two supplements I take daily.
Ed
Chocolate chip ice cream (two scoops)...
Good Luck, Good Health and Good Humor.
j-o-h-n Monday 10/26/2020 5:14 PM DST
Vitamin D & PCa. A collaborative analysis of individual participant data from 19 prospective studies.
Is Curcumin Another "Double-Edged Sword" In The Fight Against Prostate Cancer?" Still spinning my head trying to figure it out.
Pomegranate ever recommended??Rapidly decreasing level of PSA during ADT is a risk factor for early progression to CRPC.
Dutasteride (Advodart) as an Alternative to ADT in Salvage RT Setting?
