Are Injectable Peptides Worth It? A Deep Dive into Sermorelin, NAD+, and Glutathione
INJECTABLE PEPTIDES, NAD+, GLUTATHIONE & HEALTHY AGING
Are Injectable Peptides Worth It? A Deep Dive into Sermorelin, NAD+, and Glutathione
Injectable peptides and wellness compounds like sermorelin, NAD+, and glutathione are becoming increasingly popular for energy, recovery, sleep, body composition, detoxification support, and healthy aging. In this science-backed guide, I break down how these therapies work, the potential pros and cons, what to know before trying them, and why I chose Ion Layer’s physician-guided injectable pens.
Author
Craig McCloskey
Certified Nutritionist
Over the past few years, interest in injectable peptides and targeted wellness therapies has exploded. What was once reserved primarily for medical clinics and anti-aging practices has become increasingly accessible to health-conscious individuals looking to support recovery, energy, healthy aging, and overall performance.
Among the most popular options today are peptides like sermorelin, along with compounds such as NAD+ and glutathione. These therapies are often discussed in the same breath, but they work in very different ways and serve different purposes.
I've spent the last several years experimenting with wellness tools ranging from sauna therapy and red light therapy to cold plunges and targeted supplementation.
More recently, I've been exploring injectable peptide therapies, particularly Ion Layer's injectable pens. After spending time researching the science and personally experimenting with their Sermorelin Pen, I wanted to create a deeper resource that goes beyond my YouTube video and explores what the research actually says.
Read the full transcript
What's up guys? Craig McCloskey here. Today I want to talk about something I've been experimenting with for the past month or so: Ion Layer's new injectable pens. Over the past six weeks, I've been testing their Sermorelin Pen, and I've noticed some really interesting benefits including deeper sleep, more energy, improved recovery, and positive changes in body composition. Quick disclaimer: this is not medical advice. I'm simply sharing my personal experience and discussing the products I've been using. One reason I was willing to experiment with these injectable pens is because I've already been using Ion Layer's patches since 2023. I've used their NAD+, glutathione, vitamin C, Myers Cocktail, and magnesium patches for years and have had a positive experience with them. When Ion Layer launched injectable pens, I was skeptical. Like many people, I wasn't very educated on peptides. I associated them with steroids, hormone replacement therapy, or performance-enhancing drugs. After spending several months researching peptide therapy, certifications, sourcing, and safety, I decided to give them a try. One thing that stood out to me was that these products are physician-guided and require a health questionnaire before approval. That gave me confidence that I wasn't buying random peptides from an unknown source. The injectable pens are extremely simple to use. Each pen arrives preloaded, includes alcohol swabs, and comes with a month's supply of needles. The process takes less than two minutes. You simply attach a fresh needle, dial in your prescribed dose, clean the injection area, inject into the abdomen, and you're done. I've personally found the injections nearly painless because the needle is extremely small. For Sermorelin, I use the pen Monday through Friday before bed and take weekends off. Now let's talk about Sermorelin. Sermorelin is one of the most researched peptides available and has been used clinically for decades. It works by signaling the pituitary gland to naturally increase growth hormone production. Unlike growth hormone replacement therapy, Sermorelin doesn't supply growth hormone directly. Instead, it encourages your body to produce more of its own. That distinction is one of the reasons I felt comfortable experimenting with it. Growth hormone naturally declines with age, and many researchers consider it one of the key hormones involved in recovery, body composition, muscle maintenance, and healthy aging. Over the past six weeks, I've personally noticed: • Deeper sleep • More energy • Better recovery • Improved gym performance • Reduced body fat percentage • Increased lean muscle mass Of course, everyone's experience will be different, but those are the changes I've noticed. I also appreciate that Sermorelin has a long clinical history and isn't considered traditional hormone replacement therapy. Moving on to NAD+. If you've followed my content for a while, you know I'm a big fan of NAD+. NAD+ is a coenzyme found in virtually every cell of the body and plays a major role in energy production, mitochondrial health, recovery, cognitive function, and healthy aging. Low NAD+ levels are associated with aging and reduced cellular performance. I've experimented with IV NAD+, oral supplements, patches, and now injectable pens. While IV therapy can be effective, I've personally found it inconvenient and sometimes uncomfortable. The injectable pen provides a much simpler option. I view NAD+ support as something that may help support energy production, resilience, mitochondrial function, and overall wellness, especially during periods of high stress or increased recovery demands. Lastly, let's talk about glutathione. Glutathione is often referred to as the body's master antioxidant. It's naturally produced by the body and consists of three amino acids: glutamate, cysteine, and glycine. Glutathione plays an important role in: • Antioxidant defense • Detoxification pathways • Immune support • Cellular protection • Recovery Many lifestyle factors such as stress, poor sleep, alcohol consumption, illness, and environmental toxin exposure can increase oxidative stress. Glutathione may help support the body's ability to manage that stress. As a first-time dad, there are certainly periods when sleep isn't perfect and stress is higher than I'd like. Those are the situations where glutathione support becomes especially interesting to me. One thing I appreciate about Ion Layer's system is the convenience. Traditional peptide therapy can feel intimidating with vials, syringes, mixing protocols, and complicated dosing instructions. These pens remove much of that friction. Everything is preloaded, dosing is straightforward, and the entire process takes less than two minutes. For beginners interested in learning more about peptide therapy, NAD+, or glutathione support, I think the simplicity of the system is one of its biggest strengths. Overall, I've had a positive experience with Ion Layer. I've used their patches for years and now continue to use their injectable pens. If you'd like to learn more, you can visit: craigmccloskey.com/ionlayer Use code CRAIG to save 20% sitewide on injectable pens and patches. If you've experimented with peptides, NAD+, glutathione, or similar therapies, let me know your experience in the comments. Thanks for watching and I'll see you in the next video.
What Are Injectable Peptides?
Peptides are short chains of amino acids that act as signaling molecules throughout the body. In many ways, they function like messengers, telling cells to perform specific actions.
Your body naturally produces thousands of peptides that regulate everything from hunger and metabolism to immune function, recovery, and hormone production.
Because peptides occur naturally in the body, scientists have spent decades studying whether certain peptides can be used therapeutically to support specific biological processes.
It's important to understand that peptides are not the same thing as anabolic steroids.
Steroids introduce external hormones into the body. Many peptides, by contrast, work by signaling your body to increase or optimize its own natural production of certain compounds. That distinction is one reason why certain peptides have gained attention in longevity and performance circles.
That said, not all peptides are created equal. Quality, purity, sourcing, dosing, and physician oversight matter tremendously. This is one reason many healthcare professionals recommend avoiding unregulated research peptides or products sourced from unknown suppliers.
Potential Benefits of Injectable Peptide Therapy
Depending on the specific peptide being used, injectable therapies may help support:
Recovery from exercise
Sleep quality
Healthy aging
Lean muscle retention
Body composition
Immune function
Cellular repair
Cognitive performance
Research remains ongoing, and benefits vary considerably depending on the peptide, dosage, and individual.
While many users report significant improvements, peptides should not be viewed as a shortcut that replaces sleep, nutrition, exercise, or healthy lifestyle habits. They tend to work best when those foundational habits are already in place.
Potential Risks and Downsides
Like any intervention, injectable therapies come with potential drawbacks.
One consideration is cost. Many peptide therapies require ongoing use, which can become expensive over time.
There is also the inconvenience of injections. While modern injector pens have made administration much simpler, some people remain uncomfortable with needles.
Quality control is another major concern. The peptide industry has experienced rapid growth, and products sourced from unregulated suppliers may contain inaccurate dosages, contaminants, or ingredients that don't match the label.
Potential side effects vary by compound and may include headaches, injection site irritation, nausea, water retention, dizziness, or digestive discomfort.
Because long-term research is still developing for many newer therapies, it's important to work with a qualified healthcare provider and choose reputable companies that utilize physician oversight and third-party quality controls.
Sermorelin: A Peptide Designed to Support Growth Hormone Production
Of the three compounds discussed in my video, sermorelin is the one I've personally spent the most time experimenting with.
Sermorelin is a synthetic version of growth hormone-releasing hormone (GHRH), a naturally occurring peptide produced by the hypothalamus.
Its primary role is to signal the pituitary gland to release growth hormone.
This is an important distinction.
Unlike direct human growth hormone (HGH) therapy, sermorelin does not provide growth hormone itself. Instead, it encourages your body to produce more of its own growth hormone within its normal physiological pathways.
Growth hormone plays an important role in:
Recovery
Lean muscle maintenance
Body composition
Sleep quality
Tissue repair
Healthy aging
Because of this decline, therapies that support natural growth hormone production have attracted significant interest.
Many users report benefits such as improved sleep quality, enhanced recovery, increased exercise performance, and favorable body composition changes.
My own experience has mirrored several of those outcomes. Over roughly six weeks of use, I noticed deeper sleep, improved recovery between workouts, better daily energy, and measurable improvements in body composition alongside consistent training.
Of course, individual results vary, and sermorelin is not a magic bullet. Sleep, nutrition, training, and stress management still remain the foundation.
NAD+: Fuel for Cellular Energy
Few molecules have received more attention in longevity research than NAD+.
Nicotinamide adenine dinucleotide (NAD+) is a coenzyme found in virtually every cell of the human body. It plays a critical role in cellular energy production by helping convert nutrients into usable energy within the mitochondria.
NAD+ is also involved in DNA repair, cellular resilience, metabolic function, and healthy aging pathways.
One challenge is that NAD+ levels naturally decline with age.
This has sparked tremendous interest in strategies aimed at supporting NAD+ levels.
Some individuals use oral precursors such as nicotinamide riboside (NR) or nicotinamide mononucleotide (NMN), while others pursue intravenous or injectable approaches.
Users often report benefits including:
Increased energy
Improved focus
Better mental clarity
Enhanced recovery
Greater resilience to stress
Although research remains ongoing, NAD+ continues to be one of the most promising compounds in the longevity space because of its central role in cellular energy metabolism.
Glutathione: The Body's Master Antioxidant
Glutathione is often called the body's master antioxidant, and for good reason.
It consists of three amino acids: glutamate, cysteine, and glycine.
Virtually every cell in the body relies on glutathione to help neutralize oxidative stress and maintain normal cellular function.
Oxidative stress occurs when free radical production exceeds the body's antioxidant defenses. Over time, excessive oxidative stress may contribute to aging, inflammation, and chronic disease.
Glutathione plays a key role in:
Antioxidant defense
Detoxification pathways
Immune system function
Mitochondrial health
Cellular protection
Many people seek glutathione support during periods of increased stress, illness recovery, intensive training, or environmental toxin exposure.
While the body can produce glutathione naturally, some individuals choose targeted supplementation to support optimal levels.
Why Delivery Method Matters
One challenge with compounds like NAD+ and glutathione is bioavailability.
When taken orally, some compounds may be partially broken down during digestion before reaching circulation.
This is one reason why intravenous, transdermal, and injectable delivery methods have gained popularity.
Each approach has advantages and disadvantages.
IV therapy offers direct bloodstream delivery but can be expensive and time-consuming.
Transdermal patches provide a needle-free option but often require longer wear times.
Injectable pens aim to provide a middle ground by offering convenient administration with precise dosing and physician oversight.
Why I Chose Ion Layer
When evaluating any peptide or injectable therapy, sourcing and quality control are my biggest priorities.
The wellness industry unfortunately contains plenty of questionable products, particularly in the peptide space.
What initially attracted me to Ion Layer was that I had already used their transdermal patches for several years before trying their injectable pens.
Their physician-guided process, quality standards, and straightforward dosing system made them one of the few companies I felt comfortable experimenting with.
The preloaded pens eliminate much of the complexity traditionally associated with injectable therapies. There is no mixing, measuring, or complicated preparation. The process takes only a few minutes and is designed with beginners in mind.
Currently, Ion Layer offers injectable options for:
Sermorelin
NAD+
Glutathione
They also continue to offer their popular transdermal patches for those who prefer a needle-free approach.
If you're interested in learning more about Ion Layer's injectable pens or patches, you can use code CRAIG to save 20% sitewide.
You can learn more through my affiliate link at:
Final Thoughts
Peptides and injectable wellness therapies are not a replacement for the fundamentals. Consistent sleep, strength training, quality nutrition, stress management, and daily movement will always provide the biggest return on investment.
That said, therapies such as sermorelin, NAD+, and glutathione may offer additional support for individuals looking to optimize recovery, energy, healthy aging, and overall wellness.
The key is approaching these tools responsibly. Work with qualified healthcare professionals, choose reputable companies, understand the science, and focus on long-term health rather than quick fixes.
When used thoughtfully, peptide therapy can become another tool in the toolbox - not a substitute for healthy living, but potentially a complement to it.
