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Lars
May 13, 2026
Blood test showed I was severely deficient. 3 months of supplementing and mood, skin, and energy all shifted dramatically.
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SupplementsEffort · LowEasy
Vitamin D3 + K2
The hormone most people are deficient in
2.5k
4.5(2)
2,640 upvotes · 145 downvotes
5,000 IU of vitamin D3 paired with 100mcg of K2 (MK-7) daily. Vitamin D functions as a hormone that regulates testosterone production, immune response, mood, and skin cell turnover. Deficiency — extremely common in northern latitudes — is linked to hair loss, acne, poor wound healing, and low testosterone.
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What the community says
2 verified voices, averaging 4.5 of 5.
P
Priya
Jun 17, 2026
Hair shedding stopped after starting D3. Dermatologist confirmed deficiency was the cause.
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