Low D3 (23 ng/mL is mildly insufficient) can contribute to fatigue, low mood, and worse anxiety — it's a real factor and worth correcting. But what you're describing — crying, resurfacing thoughts of your past, and feeling tired of life for 8 months — sounds bigger than what a
vitamin deficiency alone usually causes. A D3 level of 23 is only mildly low; it wouldn't typically explain this level of emotional pain on its own.
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