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The gap between the two is wider than most articles make it look, and knowing which side of that gap a product sits on is the difference between actual results and wasted money

This is essentially done because the body can absorb vitamin B12 through shots without going through the digestive system

Clinical Benefits: Regulates calcium and phosphate metabolism for bone and muscle health Supports immune system modulation and reduces susceptibility to infection Associated with improved mood and reduced risk of seasonal affective symptoms May help reduce systemic inflammation Supports neuromuscular function Effective for patients with malabsorption conditions or persistent oral supplementation failure A blood test can be arranged to confirm deficiency prior to treatment, though this is not always required

And the difference between "fixing a real deficiency" and "megadosing when you're already fine" is the difference between a genuine improvement and expensive urine