Understand the source comparison
Blue Sky Peptide Alternative: Real Peptides Comparison
Synthesis Method Small-batch SPPS Bulk synthesis or undisclosed Real Peptides matches Blue Sky's synthesis rigor. Most vendors don't publish synthesis method Purity Threshold ≥98% verified via HPLC ≥98% verified via HPLC + MS 95–98% claimed, often unverified R
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- Synthesis Method
- Small-batch SPPS
- Bulk synthesis or undisclosed
- Real Peptides matches Blue Sky's synthesis rigor. Most vendors don't publish synthesis method
- Purity Threshold
- ≥98% verified via HPLC
- ≥98% verified via HPLC + MS
- 95–98% claimed, often unverified
- Real Peptides exceeds Blue Sky by adding MS verification to every batch
- COA Transparency
- Batch-specific COAs with chromatograms
- Batch-specific COAs with QR-accessible test results
- Product-level COAs or no COAs
- Real Peptides improves on Blue Sky's model with QR-linked third-party documentation
- Third-Party Testing
- Periodic (not every batch)
- Every batch tested by ISO-accredited labs
- Rare or undisclosed
- Real Peptides surpasses Blue Sky's testing frequency. Every batch externally verified
- Endotoxin Testing
- Documented in COAs
- Not standard
- Both Blue Sky and Real Peptides treat endotoxin testing as mandatory; most vendors omit it
- Sequence Verification
- Mass spectrometry on select batches
- Mass spectrometry on every batch
- Often skipped or undocumented
- Real Peptides provides higher sequence confidence than Blue Sky did