Broad-Spectrum Biohacking

The Top Five Peptides for General Health and Performance

If you’ve been enjoying the fruits of your biohacking labor, odds are you’ve attracted the attention of the uninitiated. Maybe a friend wants to know how you finally cleared up your skin, or a gym buddy wants to know how you got so vascular. They want a taste of the ‘Black Magic.’ Temper your enthusiasm. If you evangelize too hard, they’ll think you joined a peptide cult.

Keep calm and reference my list of essential peptides for broad-spectrum biohacking. The five highest ROI peptides for general health and performance with strong safety profiles. These are the peptides I would give my aging parents– if only they were open to a little biohacking wizardry.

1. GHK-Cu

Best for: Anti-Aging, Skin Health & Tissue Repair

GHK-Cu is a naturally occurring peptide found in our cells that declines rapidly with age. It is a transcription factor, meaning it alters which genes are being turned up and which are turned down. Directly supplementing GHK-Cu restores cellular transcription to a more youthful state.

Key Benefits:

• Skin: Stimulates collagen and elastin synthesis, tightens loose skin, reduces fine lines and redness, accelerates wound healing

• Hair: Promotes hair follicle growth and thickness — one of the few peptides with solid topical hair loss data

• Anti-inflammatory: Powerfully downregulates inflammatory cytokines

• Tissue repair: Supports healing of skin, bone, stomach lining, and lung tissue

Further reading: Regenerative and Protective Actions of the GHK-Cu Peptide The potential of GHK as an anti-aging peptide

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2. Retatrutide

Best for: Weight Loss, Metabolic Health & Cardiovascular Risk Reduction

Retatrutide is the category-defining evolution of drugs like Ozempic/semaglutide (GLP-1) and Mounjaro/Tirzepatide (“GLP-2”). The “More is Better” mentality wins here– Retatrutide is a triple agonist (“GLP-3”)– simultaneously targeting GLP, GIP, and glucagon receptors, making it the most powerful metabolic peptide in development. And thanks to the grey market, it’s not just in development, it’s in the refrigerator of tens of thousands of biohackers looking to boost metabolism and “mobilize lipid reserves.” Many wizards report sustained weight loss with fewer side effects on doses lower than used in the clinical trials. Starting at 1mg/week keeps food noise suppressed and side effects at bay.

How it works:

• GLP-1 agonism: Reduces appetite, slows gastric emptying, improves insulin sensitivity

• GIP agonism: Enhances fat metabolism and insulin response

• Glucagon agonism (what sets it apart): Directly increases energy expenditure and accelerates fat burning

Key Benefits:

• Clinical trials showed average weight loss of ~24% body weight in 48 weeks — exceeding even tirzepatide

• Significant reductions in triglycerides, blood pressure, and liver fat

• Preservation of lean muscle mass compared to older GLP-1 drugs

• Cardiovascular risk reduction

Current Status: Phase 3 clinical trials completed. Not yet FDA approved but widely discussed as the most promising metabolic drug in the pipeline.

Further Reading: Phase 2 Trial Results for Retatrutide

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3. BPC-157 (Body Protection Compound)

Best for: Healing, Recovery, Gut Health & Systemic Repair

BPC-157 is a synthetic 15-amino-acid peptide derived from a protein found in human gastric juice. It is arguably the most researched and versatile healing peptide in existence, with an enormous body of animal research and rapidly growing human anecdotal evidence.

How it works: BPC-157 works through multiple pathways simultaneously — it upregulates growth hormone receptors, promotes angiogenesis (new blood vessel formation), and has a profound ability to accelerate the healing of virtually any tissue type.

Key Benefits:

• Musculoskeletal: Accelerated healing of tendons, ligaments, muscles, and bone– even injuries considered difficult to heal (rotator cuff, ACL, Achilles)

• Gut: Evidence for healing IBD, ulcers, and intestinal damage

• Neurological: Neuroprotective, supports nerve regeneration

• Systemic: Reduces systemic inflammation

• Cardiovascular: Promotes healing of damaged blood vessels

Further reading: “Emerging Use of BPC-157: A Systematic Review”

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4. Epitalon

Best for: Longevity, Telomere Support, Anti-Aging & Sleep

Epitalon is a synthetic peptide developed by the St. Petersburg Institute of Bioregulation and Gerontology in Russia. As a general practice I am skeptical of compounds that come from Russia and are championed by the mystic who discovered them. However, in 2025 UK researchers independently confirmed the dose-dependent mechanisms of epitalon. Additionally, a team in Italy published a series of papers that showed its neuroprotective effects in human cell cultures.

How it works: Epitalon’s primary mechanism is the activation of telomerase– the enzyme responsible for maintaining and lengthening telomeres (the protective caps on DNA that shorten as we age). Shorter telomeres mean accelerated aging and disease.

Key Benefits:

• Telomere extension: One of the only compounds with actual human data showing telomere lengthening

• Longevity: Animal studies show consistent lifespan extension of 20–33%

• Sleep: Restores circadian rhythm and melatonin secretion– dramatically improves sleep quality in older individuals

• Cancer protection: Shown to reduce tumor incidence and suppress abnormal cell proliferation

Typical Protocol: Cycled– 10–20 days on, several months off

Further Reading: Overview of Epitalon-Highly Bioactive Tetrapeptide with Promising Properties

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5. Growth Hormone Secretagogues (GHS)

Best for: Body Composition, Recovery, Sleep, Anti-Aging & GH Optimization

Rather than a single peptide, this is a class of peptides and compounds that stimulate the pituitary gland to naturally produce and release more growth hormone (GH)-- without the risks and suppression associated with injecting synthetic HGH directly. Released in pulses during deep sleep, GH governs the nightly repair of your damaged muscle tissue. It orchestrates cellular recovery, and breaks down stored fat for fuel through activation of hormone-sensitive lipase in fat cells, mobilizing triglycerides into the bloodstream to be burned. Additionally it stimulates the liver to produce IGF-1, driving protein synthesis and preserving muscle mass. Lastly, GH promotes deeper slow-wave sleep, which is why secretagogue users report sleep improvements. Below is a comparison of the most common secretagogues.

If you haven’t tried these compounds yet, there’s no rush. The grey market isn’t going anywhere. You’ve already stumbled into the peptide corner of the internet. Embrace the idea that you’re one protocol away from becoming a wizard— it’s quite liberating!

I write about biohacking culture and peptides in a way that disqualifies me from most traditional forms of monetization. I could avoid this by not discussing protocols, dosages, or ‘unconventional’ compounds. But in my view, that would betray the point of Thinking Peptides. Consider becoming a paid subscriber to keep these articles cutting-edge and actionable. And always AI-free.