GHRP-6

What it is

GHRP-6 is a six-amino-acid synthetic peptide that acts on the ghrelin receptor to release growth hormone. It was the first of the GH-releasing peptides to be widely studied, and it is known for one thing above all: hunger. Many people feel ravenous within 15-20 minutes of an injection.

That appetite effect is useful if you struggle to eat and a major problem if you are trying to lose weight. It is an unlicensed research chemical and banned for competitive athletes.

History

Developed in the early 1980s by Cyril Bowers and colleagues, who were modifying enkephalin-derived peptides and found that some of them released GH. It was one of the first compounds to show that a small peptide could stimulate GH release through a receptor later identified as the ghrelin receptor (discovered in 1999). It has been used in clinical research but never approved as a medicine for common use.

How it works

GHRP-6 binds the ghrelin receptor (GHS-R1a) in the pituitary and hypothalamus, triggering a GH pulse. The same receptor controls appetite in the brain, which is why hunger is so pronounced. It also raises cortisol and prolactin a little. Animal studies suggest possible protective effects on the gut and heart, but human evidence is thin.

Dosage

• Commonly reported range is 100 mcg per injection, one to three times a day. Some use up to 200-300 mcg.
• It is generally taken fasted, because food and insulin blunt GH release. This also means the hunger arrives when no food is planned, so people often schedule doses around meals.
• Typical courses are 8-12 weeks followed by a break. These are community numbers, not trial protocols.

How it is taken

• Subcutaneous injection into belly fat with a 29-31G insulin syringe.
• If you want to use the appetite effect, take it 15-20 minutes before a meal. If you do not, avoid it or take it where food is not nearby.

How to reconstitute

• For a 5 mg vial, adding 5 ml of bacteriostatic water gives 1 mg/ml (1,000 mcg/ml). On a 1 ml (100-unit) insulin syringe, 10 units (0.1 ml) is 100 mcg and 20 units is 200 mcg.
• For a 10 mg vial, adding 5 ml gives 2 mg/ml. 5 units (0.05 ml) is 100 mcg and 10 units is 200 mcg.
• Add water slowly down the vial wall, swirl gently, and do not shake.

How it should arrive

A sealed glass vial with an intact cap and a small white lyophilised powder cake.

How it should look once reconstituted

A clear, colourless solution with no cloudiness or particles.

What to expect, and when

• Hunger typically starts within 10-20 minutes of injection and can last 30-60 minutes or longer.
• GH pulse happens within about 30 minutes.
• Body composition or sleep changes, if any, are reported over weeks to months.
• As with other GH secretagogues, the response can fade with continuous use.

Side effects

• Strong hunger, often described as intense and hard to ignore.
• Flushing, warmth, tingling or lightheadedness after injection.
• Water retention and puffy hands.
• Raised cortisol and prolactin: tiredness, mood changes, and in some men breast tenderness.
• Numbness or tingling in hands from high GH exposure.
• Digestive effects such as rumbling stomach, nausea or loose stools in some.

Risks

• Banned by WADA at all times for competitive athletes.
• Strong hunger can undermine weight control and trigger overeating, which matters for people with disordered eating.
• Long-term effects of higher GH/IGF-1 in healthy people are not established. This includes blood sugar changes and a theoretical effect on cancer growth, so anyone with a cancer history should avoid it.
• Less selective than ipamorelin, with cortisol and prolactin effects.
• Limited modern human safety data.
• Quality varies on the grey market.

Potential gains

• Reliable GH release, the best-supported effect.
• Appetite stimulation, which can help with weight gain in people who struggle to eat.
• Reported benefits for sleep and recovery in community reports, with limited controlled data.
• Animal data hints at gut and heart protection, which has not been confirmed in people.

Other useful information

GHRP-6 is more about appetite than any other peptide in its family. If you want GH without the hunger, ipamorelin is the more common choice. If you want hunger and GH, GHRP-6 does both. Like other GHRPs, it is often combined with a GHRH analogue for a stronger GH pulse.