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Hormonal
TSH
Thyroid-stimulating hormone — the primary screening marker for thyroid function and metabolic rate.
Optimal Range
0.5-2.5 mIU/L (optimal) · 0.4-4.0 mIU/L (lab range)
Why It Matters
Thyroid dysfunction affects energy, weight, cognition, and cardiovascular health. Even subclinical hypothyroidism (TSH 2.5-4.0) can impair metabolism and accelerate aging in some individuals.