The argument that mixed peptides are stable simply because a chromatography test showed high purity after 30 days does not hold up under basic principles of chemistry, molecular biology, or analytical science. The claim relies entirely on HPLC purity results, but HPLC only measures retention time and peak area. It does not prove that the molecular structure of a peptide is unchanged. A peptide can undergo oxidation, racemization, conformational changes, or aggregation and still appear as the same peak on a chromatogram. For example, oxidation of methionine to methionine sulfoxide changes the molecule chemically but often produces little or no shift in retention time. This means a sample can still appear 99% pure on HPLC even though part of the peptide population has been chemically altered. Detecting these types of structural changes requires more advanced techniques such as LC-MS/MS, peptide mapping, circular dichroism, NMR spectroscopy, capillary electrophoresis, or dynamic light scattering. None of those analyses were performed, so the conclusion that the peptides remained fully intact cannot be supported. Another major issue is the chemistry of copper and oxidation. When a copper-containing peptide such as GHK-Cu is mixed with other peptides, copper ions can catalyze oxidative reactions. Copper can participate in redox cycling that produces reactive oxygen species, which can oxidize amino acid side chains such as methionine, cysteine, tryptophan, tyrosine, and histidine. Methionine oxidation in particular is one of the most well-known stability problems in peptide drug formulation and pharmaceutical companies spend enormous resources preventing it. Even very small amounts of copper can catalyze these reactions, and the changes they produce may not be visible on a standard purity test. There is also the issue of peptide aggregation, which is governed by basic protein physics. Peptides in solution do not exist as isolated molecules. They constantly interact with water and with each other through hydrophobic interactions, electrostatic interactions, hydrogen bonding, and metal-mediated coordination. When multiple peptides are placed in the same solution, these interactions can create oligomers, aggregates, or misfolded complexes. Aggregation can dramatically change biological activity and receptor binding, yet aggregated peptides often still appear pure during chromatography testing because the test does not necessarily distinguish between properly folded and aggregated structures.

How are we dosing glutathione?

If you want to understand undulating neural training, you need to understand one central truth: Strength is not just a muscular quality. It is a nervous system event. Every time you lift something heavy, jump explosively, or grind through a tough set, you are not only stressing muscle fibers. You are recruiting motor neurons, activating your motor cortex, increasing neurotransmitter release, and demanding large amounts of cellular energy. The nervous system determines how much force you can express, how quickly you can express it, and how consistently you can repeat it. Undulating neural training is a way to organize training stress so that you can repeatedly access high levels of force output without burning out your nervous system. Let’s break it down step by step. What Is Undulating Neural Training? At its simplest, undulating training means the stimulus changes from session to session instead of staying the same. The intensity, volume, or emphasis “waves” across time. When we say “undulating neural training,” we are specifically talking about organizing training so that high-neural-demand sessions are alternated with lower-demand sessions in a planned rhythm. Think of it like music. If every note is played at maximum volume, the song becomes noise. If every note is soft, it lacks impact. The art is in the variation. Loud. Soft. Fast. Slow. Pause. Repeat. Your nervous system responds best to that kind of intelligent variation. Why the Nervous System Matters When you perform a maximal lift, several things happen: Your brain increases motor cortex output. High-threshold motor units are recruited. Motor neurons fire at higher frequencies. Dopamine increases to enhance drive and coordination.ATP demand rises sharply in both muscle and neurons. The stronger you are, the greater this neural demand becomes. Muscles recover relatively quickly from tension. The nervous system often takes longer. If you repeatedly stack high-intensity sessions too close together, you may notice:

I can’t find any definitive answers on (A) whether SLU needs to be cycled, and (B) if so, how long a cycle length should be. Any insights?

If we were sitting around a dinner table and someone asked me what actually runs the human body, I would not start with hormones or calories or even muscles. I would start with electrons. Because if you zoom out far enough, health is an energy story. And if you zoom in far enough, it becomes an electron story. Somewhere between those two views lives one of the most powerful partnerships inside you, the constant conversation between your mitochondria and your gut bacteria. For years we treated these as separate topics. Gut health was about bloating and probiotics. Mitochondria were something you learned about in high school biology and then forgot. But what we now understand is that they are deeply intertwined. They regulate each other through energy flow, oxygen gradients, immune signaling, and chemical messengers. They do not operate in isolation. They dance. Let’s begin at the foundation.Mitochondria are not just power plants. They are controlled electron transfer systems. Their primary job is to move electrons through a series of protein complexes embedded in their inner membrane. This is called the electron transport chain. Imagine a row of stepping stones across a river. Electrons hop from one stone to the next. As they move, they pump protons across the membrane. This creates an electrical charge difference. That charge difference is membrane potential. It is literally a battery. That battery powers a molecular turbine called ATP synthase. When protons flow back across the membrane, the turbine spins and produces ATP. ATP is what your body uses to contract muscle, fire neurons, repair tissue, and maintain barrier integrity in your gut. Underneath strength, cognition, and immunity is voltage. Underneath voltage is electron flow. Now enter the microbiome. Your gut bacteria digest fibers you cannot break down. When they ferment these fibers, they produce short chain fatty acids, especially butyrate. Butyrate is absorbed by colon cells and converted into acetyl CoA, which enters the Krebs cycle. The Krebs cycle strips electrons from nutrients and loads them onto carriers called NADH and FADH2. These carriers deliver electrons directly into the mitochondrial electron transport chain. In plain language, your gut bacteria are helping determine how many electrons enter your cellular battery system.