The 21st Century B-1 100 mg supplement provides a potent dose of Thiamine (Vitamin B1) in the form of Thiamine Hydrochloride, alongside a moderate amount of Calcium Carbonate. Thiamine is crucial for converting carbohydrates into energy, supporting nerve function, and maintaining cardiovascular health. The 100mg dosage is substantial and well above the recommended daily allowance, indicating its utility for addressing deficiencies or supporting higher metabolic demands. The inclusion of 180mg of Calcium Carbonate offers a complementary benefit for bone health, though this form of calcium is best absorbed with food, and the dosage is relatively low for comprehensive calcium supplementation alone. Nutritionists frequently highlight the importance of B vitamins for overall metabolic health. The product's extremely low price per serving (3 cents) makes it a highly economical choice for individuals seeking targeted B1 supplementation. Online reviews, though limited compared to some popular B-complex products, generally indicate satisfaction with its energy-boosting effects, aligning with Thiamine's known benefits.