Androgens, peptides, and the meal

A steroid and a peptide can sit on the same fibre and still be strangers. The androgen receptor is a transcription factor inside the myonucleus. Growth hormone binds a cytokine receptor at the surface and, in the liver, gets STAT5 to write IGF-1. IGF-1 and insulin bind receptor tyrosine kinases and run PI3K–Akt toward mTORC1. Leucine does not bind any of those. It binds sestrin2, lets mTORC1 come to the lysosome, and then waits for amino acids as bricks and for tension as the reason to keep the protein. If you stack the words and not the receptors, you get a shopping list. The fibre got three different instructions and a materials bill.

In short. Steroids talk to the nucleus. Growth-hormone peptides talk to a surface receptor. Food talks to a nutrient switch. Same muscle cell, different locks.

What an androgen adds, on top of your own hormones, is more of that nuclear instruction: more muscle protein synthesis, less glucocorticoid-driven breakdown, more satellite cells donating nuclei as a type II fibre grows. It does not occupy the growth-hormone receptor. It does not occupy sestrin2. A person can be profoundly androgen-rich and still fail to translate myosin if the essential amino acids are missing, and can still fail to store glycogen in the fast fibres if the carbohydrate never came. Bhasin's trial showed testosterone adding lean mass, and adding more of it when the men also lifted. The trial did not show testosterone replacing the meal. Nitrogen in minus nitrogen out still needs a diet.

In short. Testosterone can speed building and slow breakdown. It still cannot make myosin out of an empty kitchen, and it still is not growth hormone.

The peptides in this catalogue that people file next to bodybuilding are the growth-hormone set. Modified GRF(1–29) without DAC — sold here as CJC — binds the GHRH receptor and asks the pituitary for a pulse, if somatostatin allows it. Ipamorelin binds the ghrelin receptor, GHSR, and asks for the same pulse from the other switch. Somatropin is the 191-residue hormone itself, so it skips the pituitary and binds the growth-hormone receptor directly. IGF-1 LR3 is an 83-residue analogue built to ignore the binding proteins that usually hide IGF-1, so a dish can see IGF1R. None of them bind the androgen receptor. None of them are a 19-nor, a DHT derivative, or a 17α-alkylated oral. Putting a vial beside a steroid in a sentence does not make them one drug.

In short. CJC, ipamorelin, somatropin and IGF-1 LR3 copy parts of the growth-hormone axis. They are not steroids, and they are research reagents, not a plan for a person.

Where they meet is downstream, and only partly. IGF-1 and the insulin from a real meal both lean on Akt, and Akt lets Rheb keep mTORC1 willing. An androgen has already changed which mRNAs are there to translate, and has made satellite cells more willing. Leucine has recruited the kinase to the lysosome. Tension, through integrins and phosphatidic acid, is why the motor units you actually recruited keep the protein. You can describe that as cooperation. You cannot describe it as addition of five products. Two of the signals — nocturnal growth hormone, and insulin after you eat — already happen if you sleep and if you have a meal. A peptide is a way for a laboratory to occupy one of those receptors on purpose. It is not a missing vitamin the week was waiting for.

In short. They can point the same growth switch in the same direction. Your own sleep and your own meals already run two of those signals.

Protein is the bricks, and the range does not change because a receptor is louder. About 1.6 to 2.2 grams per kilogram per day, in meals that each clear a leucine threshold, is still the research band from the protein essay. An androgen that raises synthesis raises the cost of missing that band. It does not raise a magic new ceiling past it. In a surplus of a few hundred kilocalories, more of the synthesis can stay as tissue. In a deficit, androgens are better at defending lean mass than at inventing it, and growth hormone without those calories is mostly a lipolytic signal: fatty acids out of fat cells, collagen thickening, not a new shelf of myosin. Carbohydrate sits with the fibre type. Hard sets spend glycogen in type II fibres. A low-carbohydrate week does not become more anabolic because an androgen is present. It becomes a week where the top sets fade earlier.

In short. Eat the same protein band as anyone who lifts. A surplus lets you add tissue. A deficit mostly lets a steroid defend it. Carbohydrate still feeds the fast fibres.

Oestradiol is a nutrient story disguised as a hormone story. Aromatase lives in fat, so a higher body-fat mass turns more testosterone into oestradiol. That is why the same testosterone looks wetter in a heavier person. The oestradiol is doing jobs: bone, a share of IGF-1, joints, libido. Driving it to zero because water bothers you removes those jobs. DHT-derived steroids and trenbolone do not replace it, because they do not aromatise. If they have also suppressed your own testosterone, the oestradiol can be gone. Food does not synthesise oestradiol from olive oil. The enzyme does, from an androgen that can be a substrate. Cholesterol in the diet is a separate confusion. The HDL drop from a 17α-alkylated oral is hepatic lipase, not the butter on the plate. You can eat carefully and still watch HDL fall. You cannot eat your way out of a C17 methyl group.

In short. Body fat changes how much oestrogen testosterone makes. Wiping that oestrogen out is not a diet trick. An oral's effect on cholesterol is the liver, not the butter.

Creatine stays in its own box. Three to five grams a day fills phosphocreatine, which type II fibres spend in the first seconds of a heavy rep. It is not an androgen and not a peptide. It does not care which steroid family you were reading about. Water and sodium move with glycogen and with oestradiol, so a wet androgen plus a high-carbohydrate week looks bigger on the scale before the myosin has caught up. That scale reading is not the hypertrophy. The tape a month later, on a fibre you actually loaded, is closer.

In short. Creatine fills a fuel store. Extra weight from carbohydrate and oestrogen is water, not new muscle, until the fibre has had weeks of load.

Myosin can outrun tendon collagen. Androgens speed the fibre. Growth hormone speeds collagen too, which is why wrists and soft tissue answer, and why that is not the same as a stronger tendon under a suddenly stronger muscle. BPC-157, in the papers, is a gastric fifteen-residue peptide with a vessel and tenocyte literature. TB-500 is an actin-binding fragment of thymosin β4. Neither binds the androgen receptor, and neither is a steroid family. They are the wrong answer to 'which oral is dry', and the right neighbouring reading if the question is why a tendon hurts after the bar jumped. They are research reagents on this site. They are not a repair protocol stapled to a steroid.

In short. Muscle can get ahead of tendon. The tendon peptides in the catalogue are not steroids and not a fix you add to one.

Erythropoietin, stimulants and fat-burners are the other wrong corridor. EPO builds red cells. Androgens also thicken blood, especially boldenone and high testosterone, so stacking an oxygen drug on an androgen is two ways to raise haematocrit, not a muscle plan. Beta-2 agonists hit ADRB2 and the heart. They do not fill glycogen and they do not bind the androgen receptor. Insulin, as a storage hormone, is already coming from your pancreas when you eat the meal this page is about. Extra insulin used as a bodybuilding drug can drop blood glucose until the brain fails. That method is not going to be written here.

In short. Some drugs on a banned list do not build muscle at all. Extra insulin is dangerous enough that this page will not describe it.

So the meeting is small enough to remember. The androgen receptor changes transcription and recruits nuclei. The growth-hormone peptides, if a laboratory is using them, change the IGF-1 side of Akt. The meal changes leucine, essential amino acids, glycogen and insulin. Sleep is when a large share of your own growth-hormone pulses happen, which is why a secretagogue is a poor substitute for a night. Train the type II fibres or the androgen has fewer of them to talk to. This shop sells the named peptides for the bench, research use only. It does not sell steroids, and this section does not assemble them into a stack.

In short. Nucleus, growth-hormone signal, meal, sleep, and a bar. That is the meeting. A stack is how people pretend those are one bottle.