00:00An invisible health crisis is sweeping America.
00:03According to new research, around 40% of U.S. adults are now deficient in one critical vitamin.
00:09It's vitamin D.
00:11And doctors are warning the impact goes far beyond bone health.
00:15Severe vitamin D deficiency has now been linked to weakened immune function,
00:19increased risk of heart disease, depression, certain cancers, and even early cognitive decline.
00:25Americans most at risk, people who work indoors, those over-seated, people with darker skin tones,
00:32residents of northern states with long winters, and anyone who covers up most of their skin during summer.
00:39Symptoms can be subtle, chronic fatigue, muscle weakness, bone pain, frequent infections, or a low mood that doesn't lift.
00:46A simple blood test costs under $50.
00:49If your level is below 30 nanograms per milliliter, your doctor may recommend a supplement.
00:55Typically, 1,000 to 4,000 international units daily.
01:00It's quiet. It's common.
01:02And it's robbing 40% of Americans of their long-term health.
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