MK-677 vs HGH

The Dose Guy’s verdict

Oct 27, 2026
9 sources

HGH, if the goal is body composition and the budget allows. It takes fat off without making you ravenous, and MK-677 can claim neither. MK-677 earns its place on a bulk or for deeper sleep, where the hunger works for you, as long as you watch your fasting glucose. If you have never touched the GH axis, neither one is step one: the CJC-1295 and ipamorelin stack is.

Which would I take?HGH for the physique, MK-677 only on a bulk.

How they differ

The difference that matters is hunger. MK-677 works the ghrelin receptor, the body’s hunger switch, so its GH pulse arrives with an appetite that hits like a wall for the first few weeks and never fully leaves. HGH is the hormone itself, so you get the GH without touching the switch, and fat loss is its most reliable effect. That decides the goal split. On a cut, HGH helps and MK-677 fights you every meal. On a lean bulk, MK-677’s appetite, the deeper sleep, and the GH all pull the same way, and that is the one job where it beats paying for HGH.

The second difference is your own axis. MK-677 is a growth-hormone secretagogue, meaning it tells your pituitary to release more of your own GH, so your production stays in the loop. HGH adds GH from outside, and your pituitary dials its own output down for as long as you run it. That suppression is what you pay for HGH’s reliability.

Day to day they feel different. MK-677 is a pill before bed, so you sleep through the worst of the hunger. HGH is a morning sub-q pin, every day. Both puff you up with water early and both push blood sugar up, so on either one the scale lies for the first weeks. Judge by the mirror and the tape. If hunger is the dealbreaker but you want to keep your own GH in charge, ipamorelin hits the same receptor without the appetite, and stacked with CJC-1295 it is where I would start anyone new to the GH axis.

What the research shows

Nobody has run MK-677 against HGH, so these are different trials in different people, read side by side, not a race:

No head-to-head trial of MK-677 against HGH exists.as of Aug 2026

HGH in healthy older adults: fat mass down 2.1 kg and lean mass up 2.1 kg versus control, with total weight moving 0.1 kg.Annals 2007 · systematic review

MK-677 for a year in healthy older adults: fat-free mass up 1.1 kg against a 0.5 kg loss on placebo, body weight up 2.7 kg against 0.8 kg, and no significant difference in visceral or total fat mass.Annals 2008 · RCT · 2 yr · n=65

MK-677 25 mg in healthy older adults: fasting glucose rose from 5.4 to 6.8 mmol/L in four weeks.JCEM 1996 · dose-ranging · n=32

MK-677 25 mg in young adults: stage IV deep sleep up about 50% and REM sleep up more than 20% versus placebo after seven days.Neuroendocrinology 1997 · crossover

My read across the two programs: HGH moves fat and leaves the scale alone, MK-677 adds weight and leaves the fat where it was.

How people run them

The rhythm is the first thing you notice. MK-677 starts at 10 to 15 mg before bed, and most people hold there; 25 mg is the trial dose, not a goal. HGH starts at 1 to 2 IU each morning on an empty stomach, and most people land at 2 to 4 IU for body composition. If sleep is the only reason you want MK-677, stay at the low end and judge it by your nights; the sleep trial used 25 mg, but the hunger shrinks with the dose. Give either one months, not weeks.

Switching from MK-677 to HGH, take your last MK-677 dose at night and your first HGH pin the next morning. No washout. Start HGH low, because the water you carried on MK-677 takes a week or two to drain and HGH’s water arrives on top. Going back from HGH to MK-677, usually when the cost stops making sense, swap the same way, expect the hunger to land fresh, and give your pituitary a few weeks to come back up before you judge the result.

Plenty of people on a bulk run MK-677 at night on top of HGH. I wouldn’t. That is two glucose hits at once, and MK-677 adds hunger and water to a plan that already has HGH’s water. Pick the one that fits the goal.

HGH2–4 IU/dayMorning, empty stomach, where most people land for recomp; 1–2 IU is the gentle start.

MK-67710–15 mg/dayBefore bed, and holding here is winning; 25 mg is the trial ceiling.

MK-677 to HGH1–2 IU, next AMStart low; the old water has to drain before you judge the new dose.

HGH to MK-67710 mg, next nightExpect the hunger back within the first week.

MonitoringFasting glucoseOn either one, before you start and every few weeks after.

Side effects, side by side

Both swell you and both cost you insulin sensitivity; MK-677 adds the hunger, HGH adds the hands and joints:

commonWater retention on both, puffy hands, feet, and face, heaviest early. MK-677 can put pounds of it on in the first week. A lower dose settles it on either.

commonAn appetite surge on MK-677, which is the mechanism itself. It eases after the first few weeks but does not disappear. HGH leaves hunger alone.

commonJoint aches and carpal tunnel symptoms, tingling and numb hands, mostly an HGH problem that scales with dose.

monitorFasting glucose rises and insulin sensitivity drops on both. MK-677’s hit arrives within weeks; HGH’s grows with dose and time. Check yours before you start and keep checking.

monitorA case report of liver enzymes rising after two months of MK-677, back to normal on stopping. Get a baseline liver panel if you run it.