Protocol
Vitamin D supplementation
Cholecalciferol · Vitamin D3 · 25-OH vitamin D repletion · Calciferol
Correcting genuine deficiency is well-supported: vitamin D with calcium has long-standing human trial evidence for bone density and fracture risk in deficient and institutionalised older populations, and severe deficiency causes rickets and osteomalacia. That is the clinical floor, and it is real. What the evidence does NOT show is a healthspan or lifespan benefit in people who are already replete. Large randomised trials in generally sufficient populations (notably VITAL) found no reduction in cancer incidence or major cardiovascular events from supplementation; this is widely reported but I was unable to re-open the primary trial sources live in this session, so treat the specific VITAL result as directionally reliable rather than independently re-verified here. The telomere-maintenance framing used in Everlab's marketing rests on a secondary/ancillary analysis, which is hypothesis-generating, not proof of slowed ageing. Advantage Medical Group's own reported figure, that more than 50% of those it tests show levels below 30 ng/mL, is clinic-internal data with no published methodology, and the 30 ng/mL threshold is itself contested (some authorities use 20 ng/mL as sufficiency). Net position: clinical evidence for treating deficiency and for bone outcomes; commercial framing for anti-ageing, longevity or healthspan extension. High-dose intermittent regimens have signals of harm (increased falls/fractures in some trials), so "more is better" is not supported.
At a glance
- Evidence
- Clinical
- Singapore (HSA)
- Regulated as a health supplement. HSA states health supplements "are not subject to approvals and licensing by HSA for their importation, manufacture and sales" — there is no pre-market approval or product registration. Responsibility for safety and quality sits with the dealer, who must comply with prohibited/restricted ingredient lists, heavy metal and microbial limits, labelling requirements and vitamin/mineral dosage limits, and must hold supporting documentation. Notification to HSA is voluntary. Critically, health supplements "must not be labelled, advertised or promoted for any specific medicinal purpose" — so disease treatment, prevention or longevity/anti-ageing claims on a vitamin D product are not permitted, only support of normal body function. Verified directly from hsa.gov.sg.
- Australia (TGA)
- No TGA position on file
- Offered at
- 1 clinic
Singapore
Health Sciences Authority
- HSA status
- Regulated as a health supplement. HSA states health supplements "are not subject to approvals and licensing by HSA for their importation, manufacture and sales" — there is no pre-market approval or product registration. Responsibility for safety and quality sits with the dealer, who must comply with prohibited/restricted ingredient lists, heavy metal and microbial limits, labelling requirements and vitamin/mineral dosage limits, and must hold supporting documentation. Notification to HSA is voluntary. Critically, health supplements "must not be labelled, advertised or promoted for any specific medicinal purpose" — so disease treatment, prevention or longevity/anti-ageing claims on a vitamin D product are not permitted, only support of normal body function. Verified directly from hsa.gov.sg.
- In our SG set
- Tracked in Singapore
- SG clinics
- None on file
Australia
Therapeutic Goods Administration
- TGA status
- No position on file
- In our AU set
- Tracked in Australia
- AU clinics
- 1
Evidence is not approvalAn evidence grade describes how strong the science is. A regulatory status describes whether a body has approved the intervention for an indication. They are different questions, answered separately above.
What it is
Plain-language explainer
Vitamin D supplementation is the oral use of cholecalciferol (D3), or less commonly ergocalciferol (D2), to raise serum 25-hydroxyvitamin D into a target range, usually guided by a blood test. In longevity clinics it is positioned as a foundational, low-cost correction of a measured deficiency rather than as a drug, and is typically bundled into biomarker panels alongside other micronutrients. Clinics claim benefits spanning bone, immune, cardiovascular, metabolic and cognitive health; the strength of that claim varies sharply by outcome.
Categories
Protocol
Keep reading
Related coverage from the newsroom.
Sources
What this profile is built on
- Regulatory overview of health supplements · Health Sciences Authority (HSA), Singapore
- 10 Best Longevity Supplements · Everlab (Australia)
- Supplements and longevity: a measured, evidence-based approach · Advantage Medical Group (Singapore)
Every entity profile on variis is sourced. Not medical advice.