This is a crucial piece of the puzzle because it moves Vitamin D's role in aging from the realm of strong correlation to a measurable, mechanistic effect in a high-quality RCT. For years, we've understood Vitamin D as a master regulator of the immune system and inflammatory pathways. This study provides a direct, causal link between that function and the cellular aging clock itself.
The best way to conceptualize this is to think of telomeres not just as shoelace tips, but as the chassis of a car. Oxidative stress and chronic inflammation are the equivalent of a constant bath of road salt and acidic rain, they don't cause a single catastrophic failure, but they dramatically accelerate the rate of corrosion.
Vitamin D, in this model, isn't a new part for the car. It's the essential, systemic rust-proofing treatment that protects the underlying integrity of the structure, allowing it to endure far more stress over a longer period.
This reframes Vitamin D from a simple 'bone vitamin' into its proper role: a fundamental hormonal signal that governs the pace of systemic decay. A fantastic summary of a vital piece of research.
That’s a really good question. I would say the majority of benefit comes from not being deficient (<30nmol/L), and after that the evidence is mixed on what the best value is. It’s important to find a sweet spot, as very high levels can cause toxicity.
the consensus is so good that in France it's not even recommend to measure it since nobody know what to do with the result ! (I'm forcing traits a bit but you see the point !)
Great article and review of important clinical trial of vitamin D by Dr. Luu. Greet subsequent thread as well on goal levels, supplementation. I’m in a northern climate with light skin so I supplement year round. Others may need less, some, seasonal or none. Consult with your physician and check periodically.
As someone with extremely short telomeres and dealing with the active advanced aging of organs, this is really an interesting finding. We don’t have a treatment or cure for short telomere disease outside of organ transplant. I have had a stem cell transplant already and I now have active pulmonary fibrosis and liver fibrosis. I hope there is continued research in this area. This is not a rare disease anyone wants. Thanks for posting!
Another study that doesn’t seem to look at the difference the dose makes. What was the d3 blood level before and after supplementation for the population. Is there a particular level at which the effect changes? For those that it didn’t improve things, what were the other factors?
Below 20 ng/mL is clinically deficient
Below 30 ng/mL is insufficient.
Above 100 ng/mL is excessive.
Somewhere between insufficient and excessive is “optimum”. What dose is required to get in the “optimum” range? I doubt it is 31 ng/mL on the nose.
Hello, here we have an ancillary study of the big VITAL study published long ago.
It's interesting to underline that this subgroup show a reduction in cancer incidence with vitamin D3 since the main study with 25000 people shows no positive signal on this.
That's food for thoughts...
I just hope we could stop spending ressources on vitamin D, if there was a big positive signal with the tons of data on it we would have already found something deeply significant for human health don't you think ?
Excellent breakdown of a landmark study, Brandon.
This is a crucial piece of the puzzle because it moves Vitamin D's role in aging from the realm of strong correlation to a measurable, mechanistic effect in a high-quality RCT. For years, we've understood Vitamin D as a master regulator of the immune system and inflammatory pathways. This study provides a direct, causal link between that function and the cellular aging clock itself.
The best way to conceptualize this is to think of telomeres not just as shoelace tips, but as the chassis of a car. Oxidative stress and chronic inflammation are the equivalent of a constant bath of road salt and acidic rain, they don't cause a single catastrophic failure, but they dramatically accelerate the rate of corrosion.
Vitamin D, in this model, isn't a new part for the car. It's the essential, systemic rust-proofing treatment that protects the underlying integrity of the structure, allowing it to endure far more stress over a longer period.
This reframes Vitamin D from a simple 'bone vitamin' into its proper role: a fundamental hormonal signal that governs the pace of systemic decay. A fantastic summary of a vital piece of research.
Thanks, I love the car analogy -- another really great way to think about aging.
What blood level of vitamin D is recommended? I read wildly different opinions.
That’s a really good question. I would say the majority of benefit comes from not being deficient (<30nmol/L), and after that the evidence is mixed on what the best value is. It’s important to find a sweet spot, as very high levels can cause toxicity.
the consensus is so good that in France it's not even recommend to measure it since nobody know what to do with the result ! (I'm forcing traits a bit but you see the point !)
Great article and review of important clinical trial of vitamin D by Dr. Luu. Greet subsequent thread as well on goal levels, supplementation. I’m in a northern climate with light skin so I supplement year round. Others may need less, some, seasonal or none. Consult with your physician and check periodically.
Nothing about concomitant vit K2 and zinc?
As someone with extremely short telomeres and dealing with the active advanced aging of organs, this is really an interesting finding. We don’t have a treatment or cure for short telomere disease outside of organ transplant. I have had a stem cell transplant already and I now have active pulmonary fibrosis and liver fibrosis. I hope there is continued research in this area. This is not a rare disease anyone wants. Thanks for posting!
All the best to you, Michelle. My hope is for you to find a way forward that is beneficial to you.
Another study that doesn’t seem to look at the difference the dose makes. What was the d3 blood level before and after supplementation for the population. Is there a particular level at which the effect changes? For those that it didn’t improve things, what were the other factors?
Below 20 ng/mL is clinically deficient
Below 30 ng/mL is insufficient.
Above 100 ng/mL is excessive.
Somewhere between insufficient and excessive is “optimum”. What dose is required to get in the “optimum” range? I doubt it is 31 ng/mL on the nose.
50-60? If so, what did the 2000IU actually do.
All of those VITAL studies by JA Manson were designed to fail, which is obvious to anybody who’s ever studied nutrition. But even though they designed the studies to fail, they couldn’t help but find positive results. https://healthythinking.substack.com/p/2hours-of-video-analyzing-the-structure
Hello, here we have an ancillary study of the big VITAL study published long ago.
It's interesting to underline that this subgroup show a reduction in cancer incidence with vitamin D3 since the main study with 25000 people shows no positive signal on this.
That's food for thoughts...
I just hope we could stop spending ressources on vitamin D, if there was a big positive signal with the tons of data on it we would have already found something deeply significant for human health don't you think ?