The question of whether consuming one vitamin C tablet daily is beneficial demands a nuanced exploration through both traditional Chinese medicine (TCM) and modern biomedical lenses. From a TCM perspective, excessive vitamin C supplementation—particularly when the body's "yin" (cooling, nourishing energy) is already sufficient—may inadvertently fuel "heart fire," manifesting as restlessness, night sweats, or a rapid pulse. Modern physiology echoes this concern: high-dose vitamin C can stimulate the sympathetic nervous system, disrupting the delicate balance between the "fight-or-flight" and "rest-and-digest" modes. This imbalance may elevate cortisol levels, weaken vascular elasticity, and even interfere with sleep architecture by shortening REM cycles.

Yet, vitamin C's role as a potent antioxidant remains undeniable. When tailored to individual needs, it supports cardiovascular health by mitigating oxidative stress—a key culprit in endothelial dysfunction and arterial stiffness. The key lies in harmony: TCM emphasizes "nourishing yin to subdue fire," while modern medicine advocates for "dose optimization based on metabolic efficiency." For instance, individuals with chronic inflammation or poor sleep quality (often linked to autonomic nervous system dysregulation) may benefit from 500mg daily, whereas those with robust antioxidant defenses might experience "营卫不和" (disharmony between defensive and nutritive qi) from unnecessary supplementation. A practical approach? Pair vitamin C with foods rich in bioflavonoids (like citrus peels or bell peppers) to enhance absorption while grounding its energetic properties, and always consume it before 3 PM to avoid disrupting circadian rhythms.