يعتبر نقص النياسين، المعروف أيضًا بفيتامين «ب 3»، من المشكلات الصحية التي قد تؤدي إلى ظهور أعراض متعددة. في البداية، قد تكون هذه الأعراض خفيفة، لكن مع مرور الوقت، يمكن أن تتفاقم وتصبح أكثر حدة.
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