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98% is considered research-grade, but 99% purity is strongly preferred for tri-receptor binding assays, metabolic studies, and energy expenditure research where compound purity directly affects pharmacological accuracy across all three receptor targets

Ultrasound therapy (e.g., ultherapy): Non-invasive skin-tightening treatment that uses focused ultrasound energy to lift and tone sagging skin

(Reworded a bit.) Opiates can be a risk for false negatives because the metabolite may not be as easily detected

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