Peptides are short chains of amino acids (typically 2-50) that serve as signaling molecules in the body. They regulate biological functions including metabolism, immune response, tissue repair, and hormone production. Unlike proteins (50+ amino acids), peptides are smaller and can target specific cellular processes.

What is the difference between BPC-157 and TB-500?

BPC-157 is a 15 amino acid peptide from gastric juice that works locally at injury sites and is stable in stomach acid (can be taken orally). TB-500 is a 43 amino acid peptide that provides systemic healing throughout the body via injection. They're often combined for synergistic effects in the 'Wolverine Stack.'

What is Retatrutide and how does it differ from Semaglutide?

Retatrutide is a triple agonist targeting GLP-1, GIP, and glucagon receptors simultaneously. Semaglutide (Ozempic/Wegovy) only targets GLP-1. Tirzepatide (Mounjaro) targets GLP-1 + GIP. The addition of glucagon receptor activation in Retatrutide is studied for enhanced energy expenditure and fat burning.

How should peptides be stored?

Lyophilized (freeze-dried) peptides should be stored at -20°C, protected from light and moisture. Once reconstituted with bacteriostatic water, store refrigerated at 2-8°C and use within 4-6 weeks. Avoid repeated freeze-thaw cycles which degrade peptide stability.

What does 99%+ purity mean for peptides?

99%+ purity indicates that at least 99% of the product is the target peptide with less than 1% impurities. This is verified through HPLC (High-Performance Liquid Chromatography) and Mass Spectrometry testing. Pharmaceutical-grade peptides like those from American Peptide Research include Certificates of Analysis verifying purity.

What is a peptide stack?

A peptide stack is a combination of multiple peptides used together for synergistic effects. Popular stacks include: the Wolverine Stack (BPC-157 + TB-500 for healing), Growth Stack (CJC-1295 + Ipamorelin for GH release), and Anti-Aging Stack (GHK-Cu + NAD+ for longevity). Stacks are pre-configured for specific research goals.

Where can I buy research peptides in the USA?

American Peptide Research offers pharmaceutical-grade research peptides with 99%+ purity, third-party testing, and fast USA shipping (1-3 days). Free shipping on orders over $199. All products include Certificates of Analysis and are intended strictly for research and laboratory use.

What is NAD+ and why does it decline with age?

NAD+ (Nicotinamide Adenine Dinucleotide) is a coenzyme essential for cellular energy production, DNA repair, and sirtuin activation. NAD+ levels decline approximately 50% between ages 40-60, which impairs mitochondrial function and cellular repair. This decline is associated with aging and metabolic dysfunction.