HGH Fragment 176-191: Research Guide, Mechanism & Protocol Context

Half-Life

~30 minutes

Administration

Subcutaneous injection

What is HGH Fragment 176-191?

HGH Fragment 176-191 is the C-terminal fragment of human growth hormone corresponding to amino acids 176–191. It contains the fat-burning portion of HGH without the growth-promoting or blood sugar-affecting portions. It is the precursor compound from which AOD-9604 was developed, with similar but slightly different pharmacological properties.

Mechanism of Action

HGH Fragment 176-191 activates beta-3 adrenergic receptors in fat tissue, stimulating lipolysis (fat breakdown) and inhibiting lipogenesis (fat storage). It does not bind to GH receptors or stimulate IGF-1 production, making it metabolically neutral except for its fat-burning effects.

HGH Fragment 176-191 Dosing Protocol

250–500 mcg subcutaneous injection 1–2 times daily, ideally in the morning on an empty stomach and optionally pre-workout. Cycle: 8–12 weeks.

Administration Routes

Subcutaneous injection

Half-Life

~30 minutes

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HGH Fragment 176-191 Benefits

Targeted fat burning

No effect on blood sugar or IGF-1

No water retention

Safe for diabetics

Cartilage repair properties

Can be used long-term safely

Side Effect Profile

Extremely well-tolerated. Occasional mild injection site reactions. No blood sugar effects.

HGH Fragment 176-191 Stacking Guide

HGH Fragment 176-191 works synergistically with these compounds. Click any to learn more, or ask PepBot to build you a complete stack.

Research & Citations

HGH fragment 176-191 selectively stimulates lipolysis without affecting glucose metabolism

Biochemistry · 1996

Frequently Asked Questions about HGH Fragment 176-191

What is the difference between HGH Fragment 176-191 and AOD-9604?

AOD-9604 is a modified version of HGH Fragment 176-191 with a tyrosine residue added at the N-terminus, improving stability and bioavailability. Both have similar fat-burning mechanisms. AOD-9604 has more clinical research (including human trials by Monash University). For most researchers, AOD-9604 is the preferred choice due to better characterization.

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