Posted on 09/03/2025 9:54:10 AM PDT by Red Badger
Not from this article, but other publicaciones suggest that the optimal level is 32 ng/ml.
People who have a level of 50 ng/ml or higher have more kidney stones.
I believe your doctor is correct.
Apparently, there are a number of variables, with some populations exceeding 100 through sun exposure.
Highest Vitamin D Levels
• Indigenous populations in Tanzania, such as the Maasai and Hadzabe, have some of the highest recorded mean serum 25(OH)D levels, with studies reporting averages over 106 nmol/L, and pregnant Maasai women averaging up to 138.5 nmol/L.
• Vietnam has mean levels around 92 nmol/L for men and 75 nmol/L for women, which are also among the highest globally outside of Africa.
• Populations in the Gambia also show higher-than-global-average vitamin D levels, with mean values around 91 nmol/L in women aged 45–80.
Key Factors Influencing High Levels
• Sunlight exposure is the main reason, as these populations often live near the equator with abundant year-round sun and engage in outdoor lifestyles.
• Minimal clothing restrictions allow for more skin exposure to ultraviolet B, promoting natural vitamin D synthesis.
• Diets with some fish and non-industrialized habits may also support higher vitamin D status in some Asian populations, like Japan and Vietnam
Vitamin D blood levels just over 32 ng/mL are not directly linked to a higher risk of kidney stones in the general population, according to current evidence.
Vitamin D, Calcium, and Kidney Stone Formation
• Vitamin D increases intestinal calcium absorption, and high levels may theoretically raise blood and urinary calcium, a known risk factor for calcium kidney stones.
• However, most studies show that typical supplementation or blood levels just above 32 ng/mL do not significantly increase urine calcium or kidney stone risk in healthy individuals.
• Doses that achieve serum levels over 32 ng/mL, which are within the normal range for sufficiency, are not associated with increased kidney stone formation unless accompanied by excessive calcium intake or underlying conditions like hypercalciuria or kidney stone history.
Study Findings and Clinical Practice
• Large cohort studies and randomized trials found no significant association between vitamin D supplementation (even up to 4000 IU daily) and kidney stone formation in people without prior stones or hypercalciuria.
• Some individuals, especially those with a history of kidney stones or pre-existing hypercalciuria, may be at higher risk when taking high doses of vitamin D, so clinical monitoring is recommended in these cases.
• Combined calcium and vitamin D supplements may increase kidney stone risk, but vitamin D alone shows little effect
Via Perplexity AI
This is my source that those with a level of 50 ng/ml or higher are more likely to have kidney stones:
Increased Incidence of Nephrolithiasis (N) in Lifeguards (LG) in Israel
https://link.springer.com/chapter/10.1007/978-1-4615-9167-2_51
AI might have missed this study.
Indigenous populations in Tanzania, such as the Maasai and Hadzabe, have some of the highest recorded mean serum 25(OH)D levels, with studies reporting averages over 106 nmol/L, and pregnant Maasai women averaging up to 138.5 nmol/L.
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Note that 138.5 nmol/L is 55.5 ng/ml. Source:
https://www.grassrootshealth.net/project/ng-ml-nmol-l-converter/
Great catch! Thank you for pointing it out
I take sheep urine injections to slow my aging.
Well, it will work. Death stops aging in its tracks.................
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