Tesamorelin

Tesamorelin is a stabilised GHRH analogue, a synthetic version of growth-hormone-releasing hormone. It is not growth hormone (GH) itself, but nudges the pituitary to release the body's own GH in natural pulses. That is the key difference from direct GH: the body keeps control over the amount and rhythm.

Unlike the GLP-1 compounds, Tesamorelin is injected daily, usually in the evening. The half-life is very short at about half an hour, but the GH pulse it triggers and the later rise in IGF-1 act for far longer. It ships as a freeze-dried powder you dissolve in bacteriostatic water before the first use.

Tesamorelin binds the GHRH receptors on the pituitary and triggers a GH pulse there, similar to the one that naturally happens in deep sleep. The released GH drives IGF-1 production in the liver, and a large part of the effects run through that.

In research, Tesamorelin is mainly known for one thing: it selectively reduces visceral belly fat, the fat deep in the abdomen around the organs, and does so fairly specifically, without strongly touching the subcutaneous fat. Alongside that, a positive effect on liver fat and, in one study, on cognitive performance in older subjects has been observed.

Before you start, have everything ready. Because Tesamorelin is injected daily, you need more needles accordingly:

• The Tesamorelin vial with the freeze-dried powder
• Bacteriostatic water to dissolve it
• U-100 insulin syringes for the daily injections
• Alcohol swabs for the vial cap and the skin
• A sealable sharps container for used needles

With everything clean and in one place, the rest is straightforward.

The powder is dissolved in bacteriostatic water. How much water you add sets the concentration, and with it how many units you draw on the insulin syringe for your dose.

Use the calculator above for exactly this: pick your vial size and the water volume, and you instantly see the concentration and the units per dose. Roughly: less water means higher concentration and fewer units.

When dissolving, just add the bac water, it does not matter if it hits the powder directly. Then swirl or shake until everything has dissolved, both are fine.

The injection is subcutaneous, into the fat layer under the skin, classically into the abdomen (keep about two finger-widths clear of the navel). Many inject in the evening, because the natural GH pulse comes during deep sleep anyway and the effect leans on that.

The short version:

• Clean the spot with an alcohol swab and let it dry
• Pinch up a small fold of skin
• Insert the needle at a 45 to 90 degree angle
• Inject slowly, wait a moment, then withdraw
• Put the needle straight into the sharps container

Rotate the site day to day. Exactly because this is injected daily, that matters so the tissue does not get irritated.

Tesamorelin is well studied. In the registration-grade trial (Falutz, 2007), 2mg per day over six months selectively reduced visceral belly fat while subcutaneous fat stayed largely untouched. A later trial (Stanley, 2014) confirmed this and additionally showed a drop in liver fat. In a cognition study (Baker, 2012), GHRH over 20 weeks had a positive effect on memory and executive function in older subjects.

The individual studies with links are in the source block below.

The side effects are the ones you know from elevated GH: water retention, joint or muscle aches, occasionally tingling or numbness in the hands (carpal-tunnel-like). On top of that come injection-site reactions, which are a bit more frequent with daily use. Because GH can affect insulin sensitivity, a look at blood sugar is worthwhile with longer use. Almost all of it is dose-dependent, one more reason not to dose unnecessarily high.

Tesamorelin works through your own GH rhythm, so a few things get a lot more out of it:

• Sleep. The natural GH pulse comes in deep sleep. Good, sufficient sleep and the evening dose work together.
• Spacing from meals. Insulin blunts GH release, so the evening dose is often given with some gap from the last big meal.
• Resistance training. GH and IGF-1 do their best when the training stimulus is there.
• Enough protein for recovery.

Anyone who sleeps badly anyway or eats large amounts right before bed gives away part of the effect.

The undissolved powder is robust, normal room temperature (around 20 to 25 degrees) is fine, ideally kept in the dark. Once dissolved, the solution goes into the fridge (2 to 8 degrees) and stays stable there for at least 8 to 10 weeks with barely any loss of potency, in practice considerably longer. The bacteriostatic water brings a preservative that keeps the dissolved form stable for longer.