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A comparative review noted that the specific polymorphisms that might, in theory, favor one form are generally not reported in commercial genetic tests, and no randomized trial has validated genotype-guided form selection in healthy people

Use a sterile syringe

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Anecdotal reports from informed users suggest some benefit, particularly for targeting stubborn fat in people who are already reasonably lean

1 2 3 4 5 British national formulary : BNF 76 (76 ed.)