Side-by-side · Research reference

DihexavsHCG

Side-by-side comparison across mechanism, dosage, evidence, side effects, administration, and stack synergies. Citations on every claim where available.

AAnimal-StrongHUMAN-REVIEWED7/28 cited

BFDA-ApprovedHUMAN-REVIEWED12/52 cited

Dihexa

Angiotensin IV Analogue · Pre-Clinical

Pre-clinicalDevelopment stage

Rodent onlyEvidence basisBenoist 2014

HGF/c-MetTarget systemWright 2015

Not established — animal studies only

HCG

Glycoprotein Hormone · LH Mimetic

2,000 IUTypical dose (2×/wk)Konsam 2026 Zachariou 2026

70–90%Sperm induction rateHuijben 2026 Zachariou 2026

12–24 moTime to sperm appearanceHuijben 2026 Nariyoshi 2025

IM or SQ · 2–3×/week

01Mechanism of Action

Parameter

Dihexa

HCG

Primary target

c-Met receptor (HGF receptor tyrosine kinase)

LH receptors on testicular Leydig cellsSchröder-Lange 2025

Pathway

HGF/c-Met receptor activation → downstream signaling cascade → synaptogenesis and dendritic arborization

hCG → Leydig cell LH receptor → Intracellular cAMP → Steroidogenesis pathway activation → Testosterone synthesis

Downstream effect

Induction of dendritic arborization, synapse formation, neurogenesis, and neuroprotection in rodent models

Elevated intratesticular testosterone, restored spermatogenesis, virilization, secondary sex characteristic developmentKonsam 2026 Zachariou 2026

Feedback intact?

—

No — exogenous hCG bypasses hypothalamic-pituitary axis; endogenous LH remains suppressed

Origin

Small-molecule angiotensin IV analogue designed to activate HGF/c-Met systemWright 2015

Heterodimeric glycoprotein (alpha subunit shared with LH/FSH/TSH; beta subunit confers specificity). Available as urinary-derived or recombinant formulations.

Antibody development

—

Rare with recombinant; possible with urinary-derived formulations

02Dosage Protocols

Parameter

Dihexa

HCG

Human dosing

Not established — no human trials

—

Animal studies

Mouse/rat models only — dosing not translatable to humans

—

Evidence basis

Pre-clinical / Rodent models

RCT / Meta-analysis / FDA-approvedKonsam 2026 Huijben 2026

Clinical status

No Phase 1, 2, or 3 trials published

—

Hypogonadotropic hypogonadism (monotherapy)

—

2,000 IU IM/SQ 2–3×/weekKonsam 2026 Zachariou 2026

Titrate to normalize testosterone (300–1,000 ng/dL) or achieve target AMH ~7.4 ng/mL.

Combined therapy (hCG + FSH)

—

hCG 2,000 IU 2×/wk + rFSH 75 IU 3×/wkKonsam 2026 Nariyoshi 2025

Preferred for azoospermia; FSH added after initial hCG phase or from outset.

Triple therapy (experimental)

—

hCG 2,000 IU 2×/wk + rFSH 75 IU 3×/wk + testosterone 100 mg IM q2wkKonsam 2026

May accelerate virilization; reduces hCG requirements (~30% lower cumulative dose vs monotherapy).

Cryptorchidism (pediatric)

—

500–4,000 IU IM 2–3×/week for 3–6 weeks

Duration to sperm appearance

—

12–24 months (median ~18 mo)Huijben 2026 Zachariou 2026

Congenital HH may require longer treatment; acquired HH responds faster.

Route

—

Intramuscular or subcutaneousKonsam 2026

Monitoring

—

Serum testosterone, semen analysis q3–6mo, testicular ultrasound

Thickened seminiferous tubules (>300 μm) on ultrasound predict imminent sperm appearance.Nariyoshi 2025

04Side Effects & Safety

Parameter

Dihexa

HCG

Human safety data

None available — no human clinical trials

—

Theoretical c-Met risks

c-Met receptor activation has been implicated in tumorigenesis; unknown cancer risk profile

—

Pre-clinical tolerability

Not systematically reported in available studies

—

Injection site reaction

—

Pain, erythema (mild, transient)

Gynecomastia

—

Aromatization of elevated testosterone to estradiol; dose-dependent

Testicular discomfort / Edema

—

Rapid testicular growth in hypogonadal males; usually self-limiting

Polycythemia

—

Elevated hematocrit from supraphysiological testosterone; monitor CBC

Mood / Libido changes

—

Variable; usually positive with normalization of testosterone

Acne / Oily skin

—

Androgen-mediated; dose-dependent

Prostate concerns

—

Monitor PSA in older males; hCG restores physiological testosterone (not supraphysiological)

Antibody formation

—

Rare with recombinant; possible with urinary-derived

Absolute Contraindications

Dihexa

·Not approved for human use — research compound only

HCG

·Androgen-dependent malignancy (prostate, breast cancer)
·Hypersensitivity to hCG or excipients
·Precocious puberty

Relative Contraindications

Dihexa

·Theoretical contraindication: active or history of malignancy (c-Met pathway involvement in cancer)

HCG

·Untreated obstructive sleep apnea
·Severe cardiovascular disease (polycythemia risk)
·History of thromboembolism

05Administration Protocol

Parameter

Dihexa

HCG

1. Human administration

No established protocol. Dihexa has not been tested in human subjects. Animal studies used various routes (typically subcutaneous or intraperitoneal in rodents) not translatable to clinical use.

Add sterile water or bacteriostatic water per manufacturer instructions. Typically 1–2 mL per 5,000–10,000 IU vial. Roll gently — do not shake. Solution should be clear.

2. Legal status

Pre-clinical research compound. Not approved by FDA or any regulatory authority for human use.

Intramuscular: ventrogluteal, vastus lateralis, or deltoid. Subcutaneous: abdomen, avoiding navel (2-inch radius). Rotate sites to prevent lipohypertrophy.

3. Timing

—

Administer 2–3 times per week. Consistent weekly schedule recommended (e.g., Monday/Thursday or Monday/Wednesday/Friday).

4. Storage

—

Lyophilized: room temperature, light-protected. Reconstituted: refrigerate 2–8 °C. Bacteriostatic water extends shelf life to ~30 days; sterile water use within 72 hours.

5. Needle selection

—

IM: 21–23G, 1–1.5 inch. SQ: 25–27G, 5/8 inch. Inject slowly (30–60 seconds for IM).