We go through GenF20 Plus ingredient by ingredient, drawing on the product's own clinical trial plus NIH and Mayo Clinic material about what's in it.
At the label dose, people generally tolerate GenF20 Plus. The 2015 trial recorded mostly mild heartburn and stomach pain, at a rate close to placebo. Even so, its L-arginine and GABA can lower blood pressure, and arginine and chromium can lower blood sugar. Skip it if you're pregnant or have a cancer history, and don't use it with nitrates, blood pressure drugs or diabetes drugs unless a doctor agrees.
Leading Edge Health sells GenF20 Plus as a two-part "HGH releaser" system: enteric-coated tablets and an oral spray. It contains no growth hormone. The theory is that a mix of amino acids and other ingredients prompts your body to release more of its own. That is a far weaker claim than the marketing implies.
As of October 2026, the official GenF20 site lists these tablet amounts:
| Ingredient | Amount listed | Type |
|---|---|---|
| L-arginine | 130 mg | Amino acid |
| L-glutamine | 115 mg | Amino acid |
| L-glycine, L-lysine, L-tyrosine | 100 mg each | Amino acids |
| Astragalus root extract | 60 mg | Herb |
| Deer antler velvet | 50 mg | Animal product |
| GABA | 50 mg | Neurotransmitter compound |
| Colostrum (bovine) | 50 mg | Animal product |
| L-valine | 40 mg | Amino acid |
| Anterior pituitary powder | 30 mg | Animal gland extract |
| Phosphatidyl choline | 25 mg | Phospholipid |
| L-ornithine | 25 mg | Amino acid |
| GTF chromium | 0.1 mg | Mineral |
The site's separate ingredients page lists 16 ingredients, with L-isoleucine and Tribulus terrestris added and no amounts shown. We couldn't find the oral spray's ingredients anywhere on the official site. That's a safety gap: you can't weigh the risks of something when you don't know its contents. Read the spray label before using it, and show it to your pharmacist.
These doses are small. The 130 mg of arginine per serving is a sliver of the grams per day used in most arginine research. Small amounts make side effects less likely, but they also raise doubts about how much the formula can do. We discuss this in our article on whether GenF20 Plus works.
The only published trial of GenF20 Plus ran 12 weeks with a placebo group. Sonawane and colleagues reported it in the Open Access Journal of Clinical Trials (2015). Participants were adults between 35 and 65 living in India. Of those, 61 finished: 31 taking GenF20 Plus and 30 taking placebo. Morning and evening, each person swallowed two tablets and held 2 mL of liquid under the tongue.
Across the study, 12 adverse events were recorded: 7 with GenF20 Plus and 5 with placebo. Digestive complaints made up ten of them, namely 8 cases of hyperacidity and 2 of abdominal pain. A headache and a skin eruption below the eyes made up the rest. Two abdominal pain events counted as moderate, the others as mild, and every one resolved. No serious adverse events turned up.
For healthy adults over three months, that is a fair safety signal, but a limited one. The trial was small and short, and it excluded people with significant illness, so it couldn't pick up rarer reactions or drug interactions. Vedic Lifesciences, a contract research organization, ran it, with financial support from a company called DM Contact Management.
The official FAQ states there are "no known side effects," yet concedes the company can't guarantee safety for any one person. Its own study recorded stomach complaints, so heartburn or an upset stomach is a realistic possibility.
Mayo Clinic's list of possible arginine side effects covers nausea, abdominal pain, diarrhea, bloating, gout and headache. It also says arginine can worsen allergies or asthma and shouldn't be used after a recent heart attack. Interactions weigh more. Taken with blood pressure medicines, nitrates or sildenafil, arginine may drop pressure too low. With diabetes drugs it may lower blood sugar. Anticoagulants plus arginine may raise bleeding risk, and Mayo says not to combine it with potassium-sparing diuretics like spironolactone.
Some people prone to cold sores or genital herpes steer clear of arginine. Cell-culture research on arginine and lysine found that the herpes simplex virus needs arginine to grow, while lysine works against it. No one has shown that a 130 mg dose triggers outbreaks in people. If outbreaks are frequent for you, ask your doctor.
A United States Pharmacopeia safety review saw no serious concerns at the doses studied. It did report a temporary, moderate dip in blood pressure in some studies, so combining it with blood pressure medication could add to that. Drowsiness, headache and stomach discomfort have also been reported. The reviewers found no pregnancy or breastfeeding data and urged caution in both.
According to the National Center for Complementary and Integrative Health (NCCIH), astragalus can interact with immune-suppressing drugs and may make autoimmune disease worse. In animals it may be toxic to a developing fetus. A full safety evaluation hasn't been done.
Per the NIH Office of Dietary Supplements, chromium can add to the blood sugar-lowering action of insulin and other diabetes drugs. A small study also found that taking it with levothyroxine reduced how much of the thyroid drug was absorbed. At 0.1 mg the amount here is modest, yet if you take thyroid medication, keep the two a few hours apart.
Three ingredients, deer antler velvet, bovine colostrum and anterior pituitary powder, are animal-derived. So GenF20 Plus is out for vegetarians and vegans, and for people allergic to dairy (colostrum). Which animal supplies the pituitary powder isn't stated. Deer antler velvet is promoted as an IGF-1 source. The Defense Department's Operation Supplement Safety program warns that velvet products may contain IGF-1, a substance prohibited in tested sports. As for Tribulus, the NIH's LiverTox entry mentions mild stomach upset and a few liver and kidney case reports, mostly at high doses.
GenF20 Plus hasn't been tested with prescription drugs, so assume the ingredients' known interactions apply to the product:
Stop taking it and get medical help for chest pain, fainting, severe stomach pain, swelling, yellow skin or eyes, or a widespread rash.
GenF20 Plus uses small amounts of fairly familiar ingredients. Its single trial saw mostly mild stomach complaints, no more often than placebo. A healthy adult taking no medication looks to be at low risk, though low is not zero. Arginine, GABA and chromium can interact with blood pressure, nitrate and diabetes drugs. The spray's contents are not disclosed on the official site. And since the product aims to raise growth hormone and IGF-1, it is a poor choice if you have a cancer history. Anyone on a prescription should talk to a doctor first. For value and results, read our GenF20 Plus review.