Getting HGH injections in the United States requires a prescription, and that prescription requires a confirmed diagnosis of growth hormone deficiency. There’s no legal shortcut. HGH is one of the more tightly regulated medications, and the process involves specific blood tests and specialist evaluations before you can fill a prescription.
Why HGH Requires a Diagnosis
Unlike many hormones, human growth hormone can only be legally prescribed for a narrow set of FDA-approved conditions. In adults, the primary approved use is growth hormone deficiency, a disorder where the pituitary gland (a small structure at the base of the brain) doesn’t produce enough growth hormone on its own. The FDA has also approved HGH for muscle wasting related to HIV/AIDS and short bowel syndrome, but the vast majority of adult prescriptions are for confirmed deficiency.
This means you can’t walk into a clinic and request HGH for anti-aging, bodybuilding, or general wellness. Prescribing it for those purposes is technically off-label, and distributing it for anti-aging specifically is prohibited under federal law. If a clinic is offering HGH without testing, that’s a red flag.
Symptoms That Prompt Testing
Growth hormone deficiency in adults doesn’t look like one dramatic symptom. It’s a cluster of changes that overlap with many other conditions, which is part of why it’s underdiagnosed. Common signs include persistent fatigue, low energy, increased body fat around the midsection, reduced muscle mass and strength, decreased exercise tolerance, and changes in mood like increased anxiety, depressed mood, or difficulty concentrating.
Beyond the symptoms you can feel, deficiency also affects things measured in bloodwork: higher LDL cholesterol, lower HDL cholesterol, decreased bone mineral density (raising fracture risk), and reduced insulin sensitivity. Many people with adult-onset deficiency have a history of pituitary damage from a tumor, surgery, radiation therapy, or traumatic brain injury. Others had childhood-onset deficiency that persists into adulthood.
The Diagnostic Process
Your first step is seeing an endocrinologist, a doctor who specializes in hormone disorders. A general practitioner can refer you, or in some cases order preliminary bloodwork, but the full diagnostic workup and prescribing typically happen through endocrinology.
The initial screening usually involves measuring your IGF-1 level, a blood marker that reflects your body’s overall growth hormone activity. IGF-1 is the most sensitive marker of growth hormone action. However, it’s not definitive on its own. Between 30 and 40 percent of adults with severe growth hormone deficiency still show IGF-1 levels in the low-normal range. So a normal-ish IGF-1 doesn’t automatically rule you out, and a low one doesn’t confirm the diagnosis by itself.
If your IGF-1 is below the age-adjusted midpoint and you have a clinical history that fits (pituitary disease, prior brain surgery, or radiation), your endocrinologist will order a stimulation test. This is the definitive step. The gold-standard version is the insulin tolerance test, where insulin is given intravenously to lower your blood sugar, which normally triggers a spike in growth hormone. If your growth hormone fails to rise above a specific threshold (generally 3 to 5 micrograms per liter), that confirms deficiency.
A newer alternative is the macimorelin test, approved by the FDA in 2017. It’s an oral medication that stimulates growth hormone release, and it’s simpler to administer than the insulin tolerance test. A peak growth hormone level of 2.8 micrograms per liter or below at any point during the test confirms deficiency. Your doctor may also use a glucagon stimulation test as another alternative, particularly if the insulin tolerance test is too risky (it’s not suitable for people with seizure disorders or certain heart conditions).
What Happens After Diagnosis
Once deficiency is confirmed, your endocrinologist will prescribe a specific brand and dose of synthetic growth hormone (somatropin). Several FDA-approved brands are available, including Genotropin, Norditropin, Humatrope, Omnitrope, Nutropin, and Saizen. Each comes in a pen-style injector designed for self-administration at home. In 2020, the FDA also approved Sogroya (somapacitan), which is a once-weekly injection rather than daily.
Most traditional HGH prescriptions involve daily subcutaneous injections, meaning a small needle into the fat layer just under your skin, typically in the abdomen or thigh. Starting doses are low. For most brands, adults begin at roughly 0.15 to 0.3 milligrams per day, then adjust upward based on how your IGF-1 levels respond and whether symptoms improve. The maximum dose varies by brand but can go up to about 1.33 milligrams per day. Your doctor will recheck bloodwork every few weeks initially, then every few months to fine-tune the dose.
Before starting treatment, expect an eye examination. Your doctor needs to rule out papilledema (swelling of the optic nerve), and periodic eye checks continue throughout treatment. HGH is also not prescribed to anyone with active cancer, diabetic eye disease, or acute critical illness.
Cost and Insurance Coverage
HGH therapy is expensive. Without insurance, monthly costs can range from several hundred to over a thousand dollars depending on the brand and dose. Many insurance plans cover HGH for confirmed deficiency, but prior authorization is almost always required, meaning your insurer will want documentation of your stimulation test results and clinical history before approving coverage. Some brands offer patient assistance programs that can reduce out-of-pocket costs.
Risks of Going Outside the System
The expense and diagnostic requirements drive some people to seek HGH through online pharmacies, overseas suppliers, or anti-aging clinics that skip proper testing. This carries real risks. Products sold without a prescription are frequently counterfeit, contaminated, or contain no actual growth hormone at all. Injectable medications from unregulated sources can introduce bacterial contamination or incorrect dosing. Possessing HGH without a valid prescription is also a federal offense, as it’s classified alongside anabolic steroids under U.S. drug law.
Even with a legitimate prescription, growth hormone therapy isn’t risk-free. Common side effects include joint pain, fluid retention, carpal tunnel symptoms, and elevated blood sugar. These are typically dose-related and resolve when the dose is lowered, which is why the “start low, go slow” approach and regular monitoring matter. Taking unmonitored doses, particularly at the higher levels popular in bodybuilding circles, significantly raises the risk of these side effects and more serious complications.