Source comparison
Real Peptides IGF-1 LR3 vs Competitors Quality: What Changes at the Bench
Synthesis Method Small-batch SPPS with coupling verification every 5 residues Large-batch SPPS, no intermediate verification Competitors show 5–12% higher deletion sequence content, reducing receptor activation consistency across replicates Purification Prepar
This comparison does not assign a generated winner or score.
- Synthesis Method
- Small-batch SPPS with coupling verification every 5 residues
- Large-batch SPPS, no intermediate verification
- Competitors show 5–12% higher deletion sequence content, reducing receptor activation consistency across replicates
- Purification
- Preparative HPLC with fraction collection, purity >98% by standardized 30-min gradient
- Flash chromatography or precipitation-based purification
- Lower effective purity. Competitor peptides often contain 3–7% truncated sequences that compete for receptors without full agonist activity
- Testing Protocol
- HPLC + ESI-MS + endotoxin LAL assay on every batch; full chromatogram and mass spectrum provided
- HPLC only, often with no chromatogram; mass spec and endotoxin testing omitted or performed on reference batches only
- Sequence fidelity unverified. Competitor batches can ship with wrong peptide or high endotoxin (>5 EU/mg) contamination
- CoA Specificity
- Batch-specific CoA with synthesis date, retention time, molecular weight (observed vs expected), endotoxin level, moisture content
- Generic CoA template reused across batches; purity listed as single percentage with no supporting data
- Real Peptides CoAs allow replication of QC testing; competitor CoAs provide no verifiable method details
- Storage & Shipping
- Shipped lyophilized in sealed glass vials with desiccant; cold-pack shipping standard; storage at -20°C verified prior to dispatch
- Shipped in plastic vials or without desiccant; ambient shipping common
- Real Peptides maintains peptide stability during transit; competitors risk moisture absorption and oxidation during shipping delays
- Bottom Line
- Verifiable purity and sequence fidelity backed by reproducible test data. Designed for labs where data integrity determines funding renewal
- Labeled purity with limited or no supporting documentation. Acceptable for preliminary screens but high-risk for publication-quality work
- Real Peptides reduces experimental variability; competitor peptides introduce uncontrolled variables that can invalidate months of data