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The oral route wins on practicality, storage and needle removal

Injectable forms remain the benchmark for consistent systemic exposure, though local or compartmental activity may be feasible for some molecules designed for oral stability

References Qaseem A, Dallas P, Forciea MA, Starkey M, Denberg TD (2014) Dietary and pharmacologic management to prevent recurrent nephrolithiasis in adults: a clinical practice guideline from the American College of Physicians

Although few observational studies have examined associations between garlic consumption and cardiovascular disease risk, numerous intervention trials have explored the effects of garlic supplementation on cardiovascular disease risk factors

So if we think about pharmaceuticals, there's prescription pharmaceuticals and then there's over-the-counter pharmaceuticals