Mobile frames

Fast review on a phone.

The website is built for quick scanning: video first, readable evidence sheet second, references and safety close at hand.

Vitamin D

What it actually does

Established physiology

Vitamin D matters most when deficiency risk, intake, sun exposure, or absorption makes the question personal.

Benefit tiers

Separate strong from uncertain.

Bone healthEstablished physiology
Immune claimsContext-dependent
High dosesUse with care

Responsive behavior

  • Filter sidebars collapse into stacked controls on mobile.
  • The guide page keeps the YouTube video above the article body.
  • Back-to-top stays fixed in the lower-right corner.
  • Long labels wrap instead of shrinking or overlapping.
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