HGH Fragment 176-191 Overview, Dosing & Safety | Peptide Database

HGH Fragment 176-191 (HGH Frag)

Growth Hormone Fragment | Fat Loss Peptide

Community Research

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HGH Fragment 176-191 is the fat-burning segment of human growth hormone, corresponding to amino acids 176 through 191 of the full GH molecule. It stimulates lipolysis and inhibits lipogenesis without the growth-promoting or insulin-disrupting effects associated with full-length HGH. AOD-9604 is a modified version of this fragment with an added N-terminal tyrosine residue.

Mimics the lipolytic region of human growth hormone by stimulating fat breakdown through beta-3 adrenergic receptor pathways. Unlike full HGH, it does not bind the growth hormone receptor, so it does not increase IGF-1 levels or interfere with glucose metabolism. The fragment selectively targets adipose tissue to promote fat oxidation.

Molecular Data

Leucine

Position 1

Arginine

Position 2

Isoleucine

Position 3

Valine

Position 4

Glutamine

Position 5

Cysteine

Position 6

Position 7

Serine

Position 8

Position 9

Glutamic Acid

Position 10

Glycine

Position 11

Position 12

Position 13

Position 14

Phenylalanine

Position 15

Research Indications

Increases fat oxidation and breakdown of stored triglycerides in adipose tissue without affecting glucose homeostasis.

Reduces new fat synthesis and storage, complementing the lipolytic action for overall fat reduction.

Promotes selective fat loss while preserving lean mass, particularly effective when combined with a caloric deficit and exercise.

Dosing Protocols

Subcutaneous injection is the standard route. Best administered twice daily on an empty stomach -- once in the morning and once before bed. Avoid eating for at least 30 minutes after injection for optimal fat-burning effect.

Fat loss - Standard

250mcg

Twice daily (morning fasted + pre-bed)

SubQ

Enhanced fat loss

500mcg

Conservative start

Once daily (morning, fasted)

Reconstitution Instructions

Lyophilized HGH Frag 176-191 vial

Bacteriostatic water (BAC water)

Insulin syringes (0.5-1mL)

Alcohol swabs

Sterile work surface

1 Allow vial to reach room temperature (15-20 minutes)

2 Calculate required bacteriostatic water volume

3 Clean vial stopper with alcohol swab

4 Draw BAC water into syringe

5 Inject slowly down vial side (not directly onto powder)

6 Gently swirl until dissolved (never shake vigorously)

7 Store reconstituted solution at 2-8 degrees C

8 Use within 28 days

Interactions

What to Expect

Side Effects & Safety

Common Side Effects

Injection site irritation (redness, mild swelling)

Headache, particularly in the first few days

Generally well-tolerated with a favorable safety profile

Stop Signs - Discontinue if:

Severe injection site reactions or signs of infection

Hypoglycemia symptoms if combined with insulin (dizziness, sweating, confusion)

Allergic reactions (rare)

Any persistent or concerning symptoms

Contraindications

Pregnancy or breastfeeding

Active cancer or history of malignancy

WADA prohibited - athletes subject to testing must avoid

Quality Checklist

Good Signs

White lyophilized powder with uniform appearance

Crystal clear solution without particles after reconstitution

Certificate of Analysis showing >98% purity by HPLC

Proper cold-chain shipping

Warning Signs

Not FDA approved - research chemical only

WADA prohibited substance

Bad Signs

Discolored or clumped powder (yellow indicates degradation)

Cloudy solution after reconstitution

Collapsed or moisture-damaged appearance

Frequently Asked Questions

Is HGH Fragment 176-191 safe to use with insulin?

HGH Frag 176-191 does not affect blood glucose or insulin sensitivity directly, unlike full-length HGH. However, you should still monitor blood glucose if combining with insulin due to the fragment's lipolytic effects and the potential for unpredictable metabolic changes.

Can I combine HGH Fragment 176-191 with full-length HGH?

Not recommended. HGH already contains the 176-191 sequence, so adding the fragment provides redundant lipolytic action while increasing HGH-related side effects without proportional fat-loss benefit. Choose one or the other.

How quickly will I see fat loss from HGH Fragment 176-191?

Fat loss typically becomes noticeable around week 3-4 with proper diet and exercise. Weeks 5-8 show more significant reduction. Most users run 8-12 week cycles, with continued benefits observable through week 12.

Do I need to fast before injecting HGH Fragment 176-191?

Yes. Fasting is important for optimal effect. Inject on an empty stomach and wait at least 30 minutes before eating. Elevated insulin from food intake can suppress the lipolytic signaling that makes this fragment effective.

References

Both hGH and the C-terminal fragment (176-191) reduced body weight gain, increased fat oxidation, and stimulated lipolysis in obese ob/ob mice without affecting glucose metabolism.

The hGH fragment and its modified form AOD-9604 both increased beta-3 adrenergic receptor expression in obese mice. Effects were abolished in beta-3-AR knockout mice, confirming this receptor pathway is essential for the lipolytic action.

Characterized the metabolic properties of the hGH 176-191 lipolytic domain, demonstrating antilipogenic activity independent of the growth hormone receptor.

Oral treatment with the synthetic hGH fragment for 30 days significantly reduced body weight gain and altered lipogenic and lipolytic activity in adipose tissue of obese mice.

Related Peptides

Both target fat loss through complementary adrenergic pathways. The combination may enhance lipolysis beyond either compound alone.

Disclaimer

This information is for educational and research purposes only. Consult a healthcare professional before use.