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, functional medicine researcher, data analyst, peptide specialist

, functional medicine researcher, data analyst, peptide specialist , functional medicine researcher, data analyst, peptide specialist

Marcus Reid is a functional medicine researcher, data analyst, and peptide specialist, and one of the people who built MyPeptidePal. The platform exists in part because of the years he spent immersed in clinical literature, real-world protocols, and the kind of hands-on experimentation that most textbooks skip entirely. He is not a physician and does not pretend to be. What he is, is someone who has done the work to understand how these compounds actually function at a biological level, what the research actually says versus what the forums claim, and how to explain it in a way that makes sense to anyone willing to learn. At MPP, Marcus contributed to building the knowledge base, the protocol frameworks, and the research systems that power the platform. His work covers tissue repair, metabolic health, hormonal optimization, longevity, cognitive function, and cosmetic applications. When the science gets complicated, his job is to make it click.

Articles by , functional medicine researcher, data analyst, peptide specialist

How to Use a Peptide Dosage Calculator: A Beginner's Complete Guide

A peptide dosage calculator takes three numbers from you - the amount of peptide in your vial (mg), the amount of bacteriostatic water you added (mL), and the dose you want to inject (mcg) - and converts them into the exact number of units to draw on your insulin syringe. The amount of bacteriostatic water you add does not change your dose; it only changes how much liquid you pull into the syringe to deliver that dose. Most beginners get tripped up by this distinction, and a good calculator makes the math invisible so you can focus on getting the draw right.

Reconstitution 16 min read

Beyond Weight Loss: How Tirzepatide and Retatrutide May Help Break Addiction to Alcohol, Drugs, and More

Tirzepatide and retatrutide - dual and triple GLP-1 receptor agonists developed for weight loss - appear to reduce cravings for alcohol, nicotine, cannabis, and other substances by modulating the brain's dopamine reward pathways, not just appetite. The effect is described by users as a quiet, non-volitional disappearance of the desire to drink or use - not a battle of willpower, but a biological dimming of the craving signal itself. Early clinical and preclinical research supports this mechanism, though robust addiction-specific trials for these specific compounds are still underway, and no GLP-1 peptide is currently approved for addiction treatment.

Addiction 18 min read

Acetic Acid for Peptide Reconstitution: Why Using It Alone Is Dangerous and How to Do It Right

Using 0.6% acetic acid solution as a standalone diluent for peptide reconstitution is a common and genuinely dangerous mistake - one that spreads through forum posts and informal guides without the full picture. Acetic acid is a tool for solving a specific pH problem, and it only works safely when used in combination with bacteriostatic water at a heavily diluted ratio. Injecting undiluted 0.6% acetic acid solution subcutaneously will cause burning, welting, and potential tissue damage - and the peptide will look perfectly reconstituted right up until the moment you inject it.

Reconstitution 9 min read

GHK-Cu Topical Serums: What the Marketing Won't Tell You About Absorption, Dosing, and Formulation

GHK-Cu (copper peptide GHK-Cu) is one of the most studied peptides in skin biology, with well-characterized effects on collagen synthesis, wound healing, antioxidant activity, and skin remodeling. The problem is not the peptide - it is the products. Most topical GHK-Cu serums and creams fail in at least one of three ways: the concentration is too low to do anything meaningful, the large molecule size limits dermal absorption without a proper delivery system, or the formulation chemistry actively destabilizes the copper that makes the peptide work. This article covers what GHK-Cu genuinely does, where the topical market is getting it wrong, and what to look for if you want a product that actually delivers.

Ghk Cu 16 min read

Your Peptide Dose Is Not in Units — Here's What Actually Determines Your Dose

When peptide users say "my dose is 20 units," they are describing a volume of liquid in a syringe - not an actual dose. The real dose, measured in micrograms or milligrams, depends entirely on how much peptide was in the vial and how much bacteriostatic water was added to reconstitute it. The same syringe marking can represent doses that differ by three times or more, depending on how the vial was mixed. This article explains the dilution factor, walks through side-by-side examples, and shows how to talk about peptide doses correctly.

Reconstitution 10 min read

GLP-1 vs GLP-2 vs GLP-3 Explained: The Naming Confusion, the Real Science, and What You're Actually Buying

In the research peptide community, "GLP-1," "GLP-2," and "GLP-3" are informal shorthand nicknames used by some suppliers to relabel semaglutide, tirzepatide, and retatrutide - not actual distinct receptor classifications. The real science is that all three compounds work through the GLP-1 receptor system, with tirzepatide adding GIP receptor activity and retatrutide adding both GIP and glucagon receptor activity, making them a dual agonist and triple agonist respectively. If you have seen product names like GLP1-SEMA, GLP2-TIRZ, or GLP3-RT on a supplier site, this guide decodes what those labels actually mean and explains what the underlying science actually says.

Glp 16 min read

When a Vendor's Manufacturing Process Page Is Someone Else's: A Documented Case

Cenexa Labs published a 12-step "Cenexa Pure" manufacturing process page in October 2025. In January 2026, a near-identical 12-step page appeared on the Licensed Peptides website under Licensed Peptides branding. The copy reproduces the original's layout, illustrations and wording, and it carries several spelling errors the original does not have. It also reproduces a badge claiming to be the only US research peptide manufacturer, a claim two companies cannot both hold. The practical lesson for buyers is that a polished peptide vendor manufacturing process page is not, by itself, evidence of a real process.

Peptide News 8 min read

Why Peptides Say 'Not for Human Consumption': The Real Reason Behind the Label

Peptides sold online carry "research use only" and "not for human consumption" labels because most popular peptides have not received FDA approval for human use, and the FDA has specifically banned a large number of them from being compounded for patients. Without a legal pathway to sell these compounds as prescription drugs or approved supplements, vendors use research-use-only labeling as the only commercially viable option to put these products on the market. The label is a real regulatory designation with specific legal meaning - and it is also a protective strategy vendors use to avoid FDA enforcement. Understanding both sides of that equation is how the confusing label starts to make sense.

Peptide Education 10 min read

Switching from Tirzepatide to Retatrutide: What to Expect and Why It Might Be Worth It

Retatrutide adds glucagon receptor agonism to the dual GIP/GLP-1 mechanism of tirzepatide, which increases resting energy expenditure and accelerates fat oxidation beyond what appetite suppression alone achieves. Phase 2 trial data shows retatrutide producing substantially higher weight loss than tirzepatide's established clinical benchmarks, making it a logical consideration for people who have plateaued on tirzepatide or want a higher ceiling on metabolic outcomes. Retatrutide remains investigational as of the time of writing - it is not yet FDA-approved - so access comes through research peptide channels rather than pharmacy dispensing, and no formal switching protocol from tirzepatide has been clinically established.

Glp 13 min read

Switching from Semaglutide to Retatrutide: What to Expect and Whether It's Worth It

Retatrutide is a triple agonist targeting GLP-1, GIP, and glucagon receptors simultaneously, producing greater weight loss in Phase 2 trials than semaglutide's single GLP-1 mechanism, primarily because the glucagon component directly increases energy expenditure rather than relying on appetite suppression alone. People switching from semaglutide typically report stronger satiety, faster fat loss once retatrutide is fully titrated, and a handful of new side effects that semaglutide does not produce - including a resting heart rate increase and skin sensitivity. The main considerations before switching are that retatrutide is not yet FDA-approved, carries a higher GI burden than semaglutide at therapeutic doses, and has limited long-term human safety data - all factors worth discussing with a qualified prescriber before making any change.

Glp 12 min read

Switching from Semaglutide to Tirzepatide: What to Know Before You Make the Change

Tirzepatide activates two hormone receptors instead of one, which is why its clinical trials show meaningfully greater weight loss than semaglutide - 16.5 to 22.4 percent of body weight versus roughly 15 percent for semaglutide at approved doses. For people who have plateaued on semaglutide, want stronger metabolic effects, or simply want to understand whether switching makes sense, tirzepatide represents a genuinely different pharmacological approach rather than just a newer version of the same thing. The transition itself is straightforward - there is no washout period, and you start tirzepatide at the lowest dose the week after your last semaglutide injection - but there are important things to understand about the adjustment period before you make the move.

Glp 15 min read

Switching from Compounded GLP-1s to Research Peptides: Save Hundreds a Month Without Changing Your Dose

Compounded GLP-1 medications like semaglutide and tirzepatide and their research-grade peptide equivalents are chemically the same compound - the only difference is the form factor and the source. Compounded versions arrive pre-mixed in liquid form from a pharmacy; research peptides arrive as lyophilized (freeze-dried) powder that you mix yourself with bacteriostatic water. The dose, the titration schedule, and the weekly injection routine stay exactly the same after the switch. Most people making this transition reduce their monthly cost by $300 to $800 or more, with no change to their protocol or their results.

Glp 15 min read

GLP Peptide Comparison: Semaglutide, Tirzepatide, Retatrutide, and Beyond

The major GLP-based peptides - semaglutide, tirzepatide, retatrutide, orforglipron, survodutide, and mazdutide - each activate different combinations of three receptors: GLP-1, GIP, and the glucagon receptor. That receptor profile is what determines how each compound performs on appetite suppression, weight loss, metabolic markers, and side-effect tolerability. Tirzepatide leads on food-noise elimination and appetite suppression at standard doses; retatrutide leads on raw weight-loss magnitude at higher doses; semaglutide is the most established with the deepest long-term safety data. Orforglipron is the only oral small-molecule option in this class currently approaching regulatory approval. Understanding these distinctions is what makes the difference between picking a compound that fits your goals and picking one that does not.

Glp 19 min read

How the FDA's Bulk Peptide Reclassification May Have Been Illegal - And Why It Matters for Your Access

In September 2023, the FDA placed approximately 19 peptides into Category 2 of its compounding bulk drug substance framework - a designation that effectively blocked licensed compounding pharmacies from using them. The problem is that FDA's own administrative guidance requires each substance to be evaluated individually, with a specific balancing test applied to each compound's safety profile and clinical need. Moving roughly 19 chemically distinct substances in a single action may have bypassed that requirement. By 2026, the agency began reversing some of those restrictions and scheduling advisory committee reviews for others - a sequence that regulatory attorneys read as an implicit acknowledgment that the original action was procedurally incomplete.

Peptide Education 18 min read

Research Peptide COAs: What They Really Mean and What to Actually Look For

A Certificate of Analysis for a research peptide is a laboratory report documenting test results for a specific sample from a specific production lot - nothing more, nothing less. In the research peptide market, COAs have been heavily marketed as quality guarantees, but a visually polished COA is not the same thing as a rigorous one. What actually matters is whether an independent, accredited lab tested the specific lot you received for the right analytes - endotoxins, heavy metals, microbial content, TFA residuals, and potency alongside purity and identity - and whether the batch number on that document is traceable to the vials in your hands.

Peptide Education 23 min read