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For topical applications, you might also want sterility testing, especially if the peptide will be applied to open or fissured skin

Metabolic unpredictability: Simultaneously altering multiple metabolic pathways incretin signalling, glucagon activity, and NAD+ metabolism without clinical oversight introduces unpredictable physiological consequences

Mol Nutr Food Res 65:e2100214

In a research context, pre-formulated blends reduce preparation steps and variability between components, since the compounds are combined and documented under a single lot

If you want a comparison of why BPC-157 is commonly paired with TB-500, review: BPC-157 + TB-500 combination peptide guide