Strong evidence · Grade A
HCG
HCG (Human Chorionic Gonadotropin)
Score
80 / 100
Class
Gonadotropin hormone
Approved
Fertility / hypogonadism
Status
FDA-approved (prescription)
TL;DR
01
Human chorionic gonadotropin is a placental hormone that mimics luteinizing hormone (LH), used as an FDA-approved medicine for fertility and hormonal conditions.
02
Its evidence-based uses are real: triggering ovulation in fertility treatment, treating male hypogonadism, and correcting undescended testicles (cryptorchidism) in boys.
03
In men it stimulates the testes to make testosterone and maintains intratesticular testosterone — which is why it's used to preserve fertility alongside testosterone therapy.
04
The infamous 'HCG diet' for weight loss, by contrast, is thoroughly debunked — controlled trials show no weight benefit, and the FDA warns against it.
05
It is a prescription medicine; the weight-loss products sold online are not legitimate uses.
Approved uses
Fertility, hypogonadism
+ cryptorchidism
Intratesticular testosterone
Maintained
dose-dependent (RCT)
Fertility preservation
Yes
with TRT in men
'HCG diet'
Debunked
no weight benefit; FDA warns
Type
Glycoprotein hormone
LH-mimetic
Part 01 · How it works
Mechanism.
HCG is a hormone made by the placenta that looks, to the body, almost identical to luteinizing hormone (LH). Because of that, it can stand in for LH and tell the ovaries to release an egg or the testes to make testosterone. That's the basis for its legitimate, approved uses in fertility and low-testosterone conditions, and why men on testosterone therapy sometimes add HCG to keep their testes working. Where it goes wrong is weight loss: the 'HCG diet' pairs it with near-starvation calories, and controlled studies show HCG adds nothing — the weight loss is just from the extreme diet.
A stand-in for the body's 'go' signal to the ovaries and testes. Used for that purpose it works; used as a diet aid it's a placebo riding on a crash diet.
LH-receptor agonism
Shares the LH receptor; stimulates ovarian follicle rupture (ovulation) and testicular Leydig-cell testosterone production.
Intratesticular testosterone
In men, dose-dependently maintains intratesticular testosterone during gonadotropin suppression (fertility preservation).
Approved indications
Ovulation induction, male hypogonadotropic hypogonadism, prepubertal cryptorchidism.
No metabolic weight effect
Controlled trials show no independent weight-loss effect; the 'HCG diet' benefit is from caloric restriction alone.
Part 02 · Dosing & administration
How it's taken.
Clinical · trial-validatedValues below describe how HCG has been administered in human clinical trials and/or approved labeling. Provided for educational purposes only — this is not medical advice and not instructions for self-administration. Consult your healthcare provider before making any health decision.
Clinical
Indication-specific
Ovulation-trigger, hypogonadism, and cryptorchidism regimens differ; prescribed and monitored.
·
Doses below are from labeling, not instructions.
·
Regimens differ substantially by indication (fertility vs male hypogonadism).
·
Legitimate use is prescription-only and monitored; weight-loss use is not evidence-based.
Need help with reconstitution?
Use the free peptide calculator for dilution, unit conversion, and injection volume.
Part 03 · Safety
Side effects, rare serious events, who shouldn't.
Common
Injection-site reactions
Generally mild.
Common
Headache / mood changes
Hormonal effect.
Occasional
Gynecomastia (men)
From increased estradiol.
Possible
Serious · rare
Ovarian hyperstimulation syndrome (OHSS)
Can be serious; requires monitoring during fertility treatment.
Fertility use
Thromboembolism
Associated with OHSS.
Rare
Androgen/estradiol effects (men)
Monitor in men.
Dose-related
Absolute · do not use
×
Hormone-sensitive cancers (breast, prostate, ovarian)
×
Precocious puberty
×
Pregnancy (except under specific obstetric protocols)
×
Known hypersensitivity to HCG or any component
×
Undiagnosed uterine bleeding
×
Ovarian cysts or enlargement not due to PCOS
×
Primary hypogonadism (will not respond to HCG stimulation)
Relative · discuss first
!
Hormone-sensitive cancers (e.g., prostate) — contraindicated
!
Weight-loss use — no evidence; FDA warns against it
!
Pregnancy — not for use in pregnancy
!
Unmonitored self-administration — OHSS and hormonal risks
Interactions
Testosterone replacement therapy
HCG stimulates endogenous testosterone; concurrent exogenous testosterone may cause supraphysiologic levels
Moderate
Aromatase inhibitors (anastrozole)
HCG increases testosterone which aromatizes to estrogen; AI may be needed to manage estrogen levels
Moderate
Clomiphene citrate
Both stimulate gonadal function; additive effect on testosterone and estrogen levels
Moderate
Anticoagulants
HCG may increase thromboembolic risk; monitor coagulation parameters
Moderate
Labs to monitor
Total and Free Testosterone
Baseline, 4 weeks, then every 3 months
HCG stimulates testicular testosterone production
Estradiol (E2)
Baseline and monthly
HCG increases aromatization and estrogen
Beta-hCG Level
As needed
Confirm appropriate dosing and response
CBC with Differential
Baseline and every 3 months
Testosterone elevation can increase hematocrit
CMP (Comprehensive Metabolic Panel)
Baseline and every 3 months
Liver and kidney function
Semen Analysis
Baseline and at 3 months
If used for fertility preservation
Part 04 · Evidence
How strong is the evidence?
80
Grade A
Grade A for its approved endocrine uses — decades of use in fertility and hypogonadism with solid physiology. The score isn't higher because a large share of consumer 'HCG' interest is the debunked weight-loss use, which has no evidence.
Mechanistic plausibility
Direct LH-receptor agonism; well-understood reproductive endocrinology.
88
Human evidence
Long-established for fertility, hypogonadism, and cryptorchidism.
84
Safety & tolerability
Well characterized; OHSS risk in fertility use, and androgenic effects in men.
80
Durability
Effect tied to ongoing use; fertility outcomes are event-based.
74
Independence
Broad independent clinical use; the weight-loss claim is independently refuted.
74
Part 05 · Research log
Every study we cite.
We list each study with its methodology, funding source, and our quality grade. Flagged studies aren't dismissed — they're tagged so you can weigh them.
01
2005
J Clin Endocrinol Metab Flagged
Low-dose HCG maintains intratesticular testosterone in men with gonadotropin suppression
HCG dose-dependently maintained intratesticular testosterone in the normal range during testosterone-induced gonadotropin suppression — the physiologic basis for HCG fertility preservation in men.
Randomized dose-response trial · n = 29 · Small but rigorous mechanistic RCT.
PMID 15713727 ↗
High
Evidence against
What didn't work, and where the evidence is thin.
Every publication is incentivized to tell you a peptide works. We catalogue the null results, failed trials, and mechanism limits we found in the same literature — so you can weigh them against the upside, with your provider.
01
The 'HCG diet' is debunked
Null result regulatory/consensus · 2005
Controlled trials have repeatedly found that HCG adds no weight-loss or appetite benefit over a very-low-calorie diet alone, and the FDA has warned against over-the-counter 'HCG diet' products as unproven and potentially unsafe.
What this means: Any weight loss on the 'HCG diet' comes from near-starvation calories, not the hormone. Consumer HCG marketed for weight loss is not a legitimate use.
02
Legitimate use requires monitoring
Safety signal J Clin Endocrinol Metab · 2005
In fertility use, HCG carries a risk of ovarian hyperstimulation syndrome (OHSS); in men it raises androgens and estradiol and needs monitoring.
What this means: It is a real medicine with real effects — which is exactly why it should be used under clinical supervision, not self-administered off online marketplaces.
PMID 15713727 ↗
Part 06 · Cost & access
Where it's available, at what price.
United States
FDA-approved
Rx for ovulation induction, male hypogonadism, and cryptorchidism. Not approved for weight loss.
Prescription pricing
European Union
Approved
Approved for fertility/hormonal indications; prescription-only.
Varies
United Kingdom
Approved
Prescription fertility/hormonal use.
NHS/private
Canada
Approved
Prescription fertility/hormonal use.
Varies
The Peptide Column takes no affiliate commission from any source. HCG is a prescription medicine for fertility and hormonal conditions; the 'HCG diet' is debunked and OTC HCG weight-loss products are not legitimate. We link only to clinician-directed care, never to sellers.
Part 07 · Your appointment
Questions to bring.
01
Should I use HCG concurrently with TRT or is it unnecessary for my situation?
02
What dose and frequency of HCG is appropriate to maintain fertility?
03
How will HCG affect my estradiol levels, and should I monitor for estrogen-related side effects?
04
What labs should I track while on HCG (testosterone, estradiol, LH, FSH, semen analysis)?
05
Is recombinant HCG preferable to urinary-derived HCG?
06
Are there alternatives to HCG for maintaining fertility on TRT, like enclomiphene?
References
Every citation, numbered.
Citation list. For our editorial read of each study — including bias flags and quality grades — see the Research log above.
- 01. Low-dose HCG maintains intratesticular testosterone in men with gonadotropin suppression · J Clin Endocrinol Metab, 2005 · PMID 15713727 ↗
- 02.