The short answer · Vitamin D status
Take vitamin d3 (cholecalciferol) for vitamin d status. This is the one to buy.

ChildLife Essentials, Vitamin D3, Natural Berry, 12.5 mcg (500 IU), 1 fl oz (30 ml)
4.9· 63,872 ratings· $0.08/serving
Vitamin D3 (Cholecalciferol) 500 IU — inside the studied 400-5000 IU window
Of 8,136 products scored for Vitamin D status, ChildLife Essentials, Vitamin D3, Natural Berry, 12.5 mcg (500 IU), 1 fl oz (30 ml) ranks #1 with a DoseRank score of 87. Vitamin D3 (Cholecalciferol) is the strongest evidence signal for this outcome.
The form“Why Vitamin D3 (Cholecalciferol)?”Evidence Strong evidence
Vitamin D3 (Cholecalciferol) is the strongest evidence signal for this outcome.
- Vitamin D3 (Cholecalciferol)The pick
Strong evidence · 500 IU
The form made by skin on sun exposure and used in most supplements; converts to active calcitriol and raises serum 25(OH)D more effectively than D2.
The dose“Is the dose actually effective?”Dose fit 67
Vitamin D3 (Cholecalciferol) at 500 IU lands inside the studied 400-5000 IU window.
Vitamin D3 (Cholecalciferol)
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ChildLife Essentials, Vitamin D3, Natural Berry, 12.5 mcg (500 IU), 1 fl oz (30 ml) ranks #1 for Vitamin D status with a DoseRank score of 87. The score blends clinical strength, evidence, dose fit, trust signals and value across 8,136 products scored for this outcome.
Vitamin D3 (Cholecalciferol) is the strongest evidence signal for this outcome.
Vitamin D3 (Cholecalciferol) at 500 IU lands inside the studied 400-5000 IU window. DoseRank scores this product's dose fit at 67 out of 100.
ChildLife Essentials, Vitamin D3, Natural Berry, 12.5 mcg (500 IU), 1 fl oz (30 ml) works out at $0.08 per serving. $0.08 per serving — low price tier for this outcome. Nothing else in this ranking costs less per serving.
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