Updated: 01/10/2017 - Site operated by Pronabolin
By Summer Banks Jan 04, 2017

Many men are searching for the best testosterone booster. We looked deep into Growth Factor-9, focusing on the ingredients, side effects, clinical research and customer service. We read hundreds of user comments and reviews. Then, we condensed and refined to give you the info you need.

Growth Factor-9 Readers: Click here to find out why we're giving away samples of our product, Pronabolin.

What is Growth Factor-9?

First off, Growth Factor-9 is a natural growth hormone booster. [1] It contains l-lysine HCL, l-arginine HCL, oxo-proline, n-acetyl l-cysteine, l-glutamine and Schizonepeta powder. [2] [3] You take four capsules as two, twice daily and the formula is supposed to help you “unleash your total performance.” The bottle is small enough to travel with, one benefit.

The product, formulated by Novex Biotech sometime after 2005. The supplement is sold on the official website and through trusted retailers. We like that the business has been around for more than 10 years and the BBB rating is good, but read on…

No One’s Getting Results – “A Problem?”

The first problem users have pertains to the effectiveness of Growth Factor-9 ingredients. Many people using the product just don’t see any results. “The competition in the supplement market is strong right now,” says our Research Editor. “If you can’t provide a formula that works, you’ll lose your spot on the shelf real quick.”

“I’ve taken the product for almost 30 days. 4 capsules per day as recommended. I’ve not notice any improvement in are area of my daily regimen. I push myself very hard and it may be that the product isn’t for someone who is an advanced athlete,” says a user.

“I purchased two bottle of GF-9 and consumed according to instructions. I did not feel any difference after two months,” offers another.

On the flip side, there are users who saw results.

One said, “Had a sore shoulder for months that kept me from lifting heavy. I stacked this with Testrovax and the soreness went away.”

As another put it, “There is a…(positive) difference in my energy levels, my ability to exercise, and my ability to recover.”

Growth Factor-9 Side Effects – “I Don’t Feel So Good”

Growth Factor-9 side effects are an issue that comes up in more than a few reviews. “I have been taking this for 3 weeks, I have gained 4 pounds. I believe it is water which makes me wonder why I would be retaining so much water,” one user explains.

“I have been taking this product for over a week now and have experienced fatigue and brain fog like never before,” says another. [4]

Some simply took the side effects and turned them into a benefit or experienced none at all.

“It did give me some anger issues, but channeling it to my workouts has increased my bench,” shared one user.

A customer claimed, “I can say that I didn’t experience the sleeplessness some have complained about.”

Based on our research, a supplement only needs one issue, like no changes to strength or muscle size, to ruin the chances of long-term success. If Growth Factor-9 results are not what the user expects them to be, the product doesn’t have long in this business.

Is There Verifiable Science?

Hidden in the product description of Growth Factor-9 does mention of a study. According to the information, the supplement can increase human growth hormone levels by more than 650%. There is no link to the published paper, but we did find even better information. The Journal of Clinical Investigation reports a “threefold increase in total GH secretion” within the first 24 hours with intermittent fasting. This method is free and clearly proven to work. At DietSpotlight, we’re looking for proof. If there’s none to be had, there’s no reason to stick around. [5]

The Bottom Line – Does Growth Factor-9 Work?

Are you sitting on the edge of your seat yet? Our interest in Growth Factor 9 leads us to a solid conclusion. We like that all ingredients are listed online and there are some reports of positive results. But, we don’t feel completely comfortable recommending the product because there are far too many negative reviews. Fasting appears to increase human growth hormone better than the supplement.

If it’s time to boost testosterone levels, our suggestion is to go with a supplement with a clinically-tested ingredient list. Check for no harmful side effects and a price that’s easy on your bank account.

Among the best products we’ve seen in 2016 is one called Pronabolin. The formula combines nine clinically researched ingredients packed into a proprietary blend. It has been shown support energy and naturally boost testosterone levels. We found no mention of harmful side effects like those that come with prescription options. But, users are surely talking about the great results they’re seeing.

Plus, the makers of Pronabolin are so confident in their product they’re offering every customer a 120-day money-back guarantee and multiple-bottle discounts.

Previous Growth Factor-9 Review (Updated July 17, 2014):

Growth Factor-9: What You Should Know

Growth Factor-9 is a hormone booster, according to the product description on GNC, but at first glance there is no mention of the hormone the supplement is supposed to increase. By contrast, products like Test Worx serve to suppress hormones, namely sex hormone binding globulin to boost testosterone. We assume, based on the product's name, human growth hormone or HGH is the hormone the company is referring to, but we did not immediately notice any mention of HGH. Many of the ingredients can found in similar bodybuilding supplements like Crevalor. We did immediately notice the $100 price tag, which either means the product is packed with expensive ingredients or the company is hoping the buyer will look at the claims and hit the Add to Cart button without questioning the ingredients. This company also makes TestroVax.

List of Ingredients

  • L-Arginine HCL
  • L-Lysine HCL
  • N-Acetyl L-Cysteine
  • L-Glutamine
  • Oxo-Proline
  • Schizonepeta Powder

Growth Factor-9: Product Features

The first four ingredients are nothing special and certainly not worth the $100 price tag like Megatropin. The dieter can find l-arginine, l-lysine, n-acetyl l-cysteine and l-glutamine in a long list of bodybuilding, diet and protein supplements, similar to Serious Mass. If Novex Biotech, the makers of Growth Factor-9, wants to convince the consumer to spend that much money the last two ingredients better have a strong clinical background. Oxo-proline, also referred to as pyroglutamic acid, is a rare amino acid. We found no clinical studies supporting any health benefits of this ingredient, but we did find mention of at least one case of 5-oxoproline acidosis in patients with long-term use of acetaminophen. It has special properties not related to weight control not unlike the Folic acid found in Factor 2. We also found reference that oxoproline may be used on the skin to hold in moisture. Schizonepeta is an herb commonly used to treat the common cold and skin conditions like eczema. There are no health benefits even slightly associated with growth hormone production, according to WebMD.

Growth Factor-9 Advantages

  • We found all the ingredients listed for Growth Factor-9.

Growth Factor-9 Disadvantages

  • The supplement is overpriced.
  • None of the ingredients are associated with growth hormone production.
  • Growth hormone is never mentioned.
  • We were unable to find the clinical study supporting increased serum hormone levels.
  • The reviews mention weight loss, increased lean muscle, fat loss and improvements to sleep – none of which are listed in the product description.


We are quite confused by this supplement. The reviews are mixed and none of the literature names growth hormone. There is mention of a serum hormone, but not serum growth hormone. Likely Growth Factor-9 Side Effects also concern us a bit. The clinical study referenced in the product description and on the product label is impossible to trace and there is no link to where the study was completed or published. We suggest dieters choose a different product for weight loss as we are not completely sure what this product is designed to do.

Growth Factor-9 Questions & Answers:

We boiled down hundreds of user comments about Growth Factor-9 into this helpful FAQ.

What are the side effects of Growth Factor-9?

Some potential side effects of Growth Factor-9 include upset stomach, bloating and bowel discomfort. [1]

What are the ingredients in Growth Factor-9?

Growth Factor-9 ingredients are l-lysine HCL, l-arginine HCL, oxo-proline, n-acetyl l-cysteine, l-glutamine, schizonepeta powder, rice flour, gelatin, magnesium stearate, microcrystalline cellulose, silicon dioxide and titanium dioxide.

Does Growth Factor-9 work?

There’s information on the official website claiming Growth Factor-9 is effective, but no links to the actual study(ies). You may want to change things up a bit and switch out Growth Factor-9 with a supplement like Pronabolin, which consists of ingredients clinically proven effective.

How much does Growth Factor-9 cost?

Growth Factor-9 costs $99. You receive 30 capsules in each bottle.

How should I take Growth Factor-9?

You should take four Growth Factor-9 capsules in the morning or evening, prior to eating. The company recommends not taking more than four within 24 hours and always on an empty stomach.

Can I take Growth Factor-9 if I have a health condition?

People taking prescription medication, anyone with health conditions, under 18 years of age or women who are pregnant or nursing should contact your licensed physician prior to using a dietary supplement, including Growth Factor-9.

What do users like about Growth Factor-9?

Some users like that Growth Factor-9 is readily available and that they noticed small changes in their physique.

What do users NOT like about Growth Factor-9?

We found that some Growth Factor-9 users reported side effects and there were instances of the supplement not working.

How do I contact the Growth Factor-9 customer service department?

You can contact the customer service department by calling 1-800-559-1383, sending emails to customerservice@novexbiotech.com or mailing correspondence to Novex Biotech 5742 Harold Gatty Dr. Salt Lake City, UT 84116.

Does Growth Factor-9 contain synthetic human growth hormone (HGH)?

Growth Factor-9 does not contain synthetic ingredients.

Do you need to exercise on Growth Factor-9?

No, you don’t need to exercise on Growth Factor-9, but the company suggests adding a fitness plan to achieve better results.[2]

Is there a guarantee?

Growth Factor-9 offers a money-back guarantee, but the company doesn’t state the time frame allowed to receive a full refund.

Do you know of any special deals or discounts on Growth Factor-9?

The only discount noted on the official Growth Factor-9 website is automatic billing, where the company charges $80 for an additional 30-day supply, instead of $99. However, the last several months have been buzzing with our readers taking advantage of Pronabolin’s multiple-bottle discount and 120-day money-back guarantee. Click here to try it out.

Growth Factor-9 Side Effects:

There are people talking about Growth Factor 9 HGH supplement, so we decided to pay closer attention to Growth Factor 9 side effects. (Feel free to read our full Growth Factor 9 review.) We’ll focus on the ingredients and clinical research. Furthermore, we will take a look at consumer comments. Then, we summarize the info to give you the bottom line.

What You Need to Know About Growth Factor 9 Side Effects

First off, Growth Factor 9 is a human growth hormone supplement, containing l-lysine HCL, l-arginine HCL, oxo-proline, n-acetyl l-cysteine, l-glutamine and schizonepeta powder. The recommended serving is four capsules per day, which supposedly results in increased strength. Ease of use is a positive.

The product, introduced as a dietary supplement more than two decades ago by Novex Biotech, doesn’t appear to include synthetic ingredients, one positive. You can shop for the product on the official website and through various retailers. We like the company’s foothold in the industry and that we located some positive customer comments, but read on…

Fluid Retention

The first concern about Growth Factor 9 side effects was fluid retention. “You’re trying to lose weight and boost muscle growth,” said our Research Editor. “Holding on to water is the last thing you’d consider positive in these circumstances.”

“I have been taking this for 3 weeks, I have gained 4 pounds. I believe it is water which makes me wonder why I would be retaining so much water. If this does not change it will be my last purchase. I am not feeling any better and have no more energy than before starting this supplement,” said a consumer.

”Fluid retention and expansion of the extracellular fluid compartment commonly observed after standard total parenteral nutrition can be attenuated by administering glutamine,” reported the Annals of Surgery.

Growth Factor 9 Side Effects – Mental Concerns

According to customer comments, Growth Factor 9 side effects include metal concerns. “I’ve used the product but I see not much difference I followed the instructions. The only thing I noticed was my anger issues,” said a dieter.

“Brain fog. I have been taking this product for over a week now and have experienced fatigue and brain fog like never before,” reported a customer.

“I was battling some winter blues and was really struggling with health-related motivation. My workouts were regular, but lacking in energy or extra effort,” commented a user.

Based on our experience and research, something little, like mental concerns, could derail long-term success. If Growth Factor 9 causes a lack of focus, there’s a problem.

The Science

The official Growth Factor 9 website claims that there’s clinical research associated with the supplement, but the company fails to produce links to the studies. According to the FDA, “HGH products are new drugs and cannot be legally marketed in the U.S. without an approved application.“ At DietSpotlight, locating information supporting claims is critical. If there’s no science, there’s a concern.

The Bottom Line on Growth Factor 9 Side Effects

After taking a closer look at Growth Factor 9, here’s our verdict. We like that the company has been operating for years and that we found some positive customer comments, but we can’t find links to published clinical research supporting the claims. Plus, we’re concerned that mental issues and fluid retention could be a problem.

If you want to see real weight-loss, we recommend going with a supplement supported by published clinical research with no known negative side effects.

Leptigen is one of the best supplements we’ve researched this year. The product contains a formula consisting of a four-ingredient proprietary blend, which has been shown in published clinical studies to help promote fat loss and ignite metabolism. There’s no one talking about negative side effects and comments on the web show that people are seeing excellent results.

The company that makes Leptigen is offering a Special Trial Offer, a good sign of confidence in a product.

  • References
  • 1. (). . .

Growth Factor-9 is a human growth hormone that claims to promote better performance.

Growth Factor-9 Ingredients and Supplement Facts

Serving Size: 4 Capsules
Serving Per Container: 30
Amount per Serving % DV
SeroVital 2.90g *
L-Arginine HCl * *
L-Lysine HCl * *
N-acetyl L-Cysteine * *
L-Glutamine * *
Oxo-Proline * *
Schizonepeta (aerial parts) powder * *

Other Ingredients: Rice Flour, Gelatin, Magnesium Stearate, Microcrystalline Cellulose, Silicon Dioxide, Titanium Dioxide

You deserve to know everything about a product. Here are the facts on Growth Factor-9 ingredients.

L-Lysine HCL

L-lysine HCL is an essential amino acid. It is taken in through the diet. Foods that contain significant amounts are chicken, fish, beef, cheese, fruits and vegetables. [1]

What is it Supposed to Do?

L-lysine HCL is used throughout the body. It assists with calcium absorption, recovery, hormone production and building of muscle protein.

Clinical Research

The Journal of Agriculture and Food Chemistry published a study that said, “continuous feeding of a Lys-rich diet may increase skeletal muscle mass.”

L-Arginine HCL

L-arginine HCL is also an amino acid supplied by the diet. It is a critical part of muscle production.

What is it Supposed to Do?

L-arginine has many functions. It is converted into the chemical nitric oxide, which expands blood vessels and increases blood flow. It also takes part in the release of insulin and growth hormone, among other processes.

Clinical Research

A study in Applied Physiology, Nutrition and Metabolism reports increased blood volume, but not strength. “We found that acute L-arg supplementation increases Mbv [muscle blood volume] during recovery from sets of resistance exercise with no increase in strength performance.”

We know how important a trusted supplement is when you’re trying to help build more muscle and reverse the symptoms of aging. Pronabolin has clinically tested ingredients.


Oxo-proline is also known as pyroglutamic acid. We found little information and no clinical trials associated with muscle growth, strength or energy.

N-Acetyl L-Cysteine

N-acetyl l-cysteine is also referred to as n-acetyl cysteine. The amino acid and antioxidant has been used for years as a natural treatment for carbon monoxide or acetaminophen poisoning, chest pain, chronic bronchitis, hay fever, COPD and more. [2]

What is it Supposed to Do?

We know from research that L-acetyl l-cysteine binds to the poisonous parts of acetaminophen in the liver to treat poisoning. We also know it is an antioxidant, so it helps fight free radical damage.

Clinical Research

Cancer Epidemiology, Biomarkers & Prevention offers a study that says, “We conclude that NAC [n-acetyl l-cysteine] has the potential to impact upon tobacco smoke carcinogenicity in humans because it can modulate certain cancer-associated biomarkers in specific organs.”


L-glutamine is an amino acid that’s already in your body. There is a proven connection to the treatment of burns, trauma, weight-loss in people with HIV/AIDS, mouth soreness after chemotherapy and immune function after surgery.

What is it Supposed to Do?

We found it difficult to find research connecting l-glutamine to muscle growth or recovery in otherwise healthy individuals.

Clinical Research

One study we found in the Iranian Journal of Basic Medical Science claimed, “the present study indicates that L-glutamine supplementation has no significant effect on muscle injury markers in between groups.”

Schizonepeta Powder

Schizonepeta powder is made from the schizonepeta plant. We found no evidence of benefit with supplementation. The only warning we found was for women who were pregnant or nursing to avoid use.

What Supplement Caught Our Attention?

Improving performance is often associated with testosterone levels in men. One of the best test boosters we’ve found is Pronabolin. Readers are going nuts over the multiple-bottle discount and 120-day money-back guarantee. Click here to learn more.

Learn More About Pronabolin »
About the Author:

Summer Banks, a content strategist at Leptigen, has researched over 5000 products in the past 10 years. She has years of nursing training, experience as a manager responsible for 15 supplement brands, and completed coursework on Food and Nutrition from Stanford University. full bio.

Rating: 4.2. From 125 votes.
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User Comments

26 Comments on "Growth Factor-9 Review"


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I never received my order and I was charged $170 and it hasn’t been returned

I didnt know where to find this info then kaboom it was here.

For me is perfect, diminishing stress, felling great

I am taking IGF9 from last 25 days after how many days it will start working

Ordinarily dieters experience some sort of results in a month. Seeing as how you’re nearing this point the product may not be effective for you. Are you following the directions closely?

Do I should take it only in workout days ?or everyday even without training? ?.

Everyday. The company recommends not taking more than four within 24 hours and always on an empty stomach.


does what it suppose to!! I feel stronger than ever!!

One month in how cm taking

You take four capsules as two, twice daily and the formula is supposed to help you “unleash your total performance.

This product used by any side effects how many rupees

Hi Midhun, some dieters report light headedness and fatigue. The price, depending where you purchase, ranges from 90-100 USD

Kisses! GH 9 is fantastique. No magic bullets or pills anywhere. You get out what you put in. See my earlier comment on this page.

IV seen a big change in my energy I feel 10years younger my sleeping is better I feel stronger and I’m losing weight because of my appetite has decreased.. I’m taking testosterone with this product together it’s the fountain of youth.. No lie!!

Really appreciate the point-blank review of the Growth Factor-9. Your evaluation was similar to what I was explaining to some of my clients. Because your review was simply stated and easy for all to read/understand, I have sent my inquisitive Clients to your site specifically to read the reviews of this and other products on the diet market.

Been using it religiously for 4 months now. 4 capsules early in the morning and fast until lunch. Gone from 210 lbs down to 195, dropped two inches from my waist and added considerable mass to my upper body. When a former user mentioned she quit the vitalsterol version because of heart irregularities, recognized that I too had began feeling mild chest pains. Has anyone else experienced this?

Anyone else experience effects like this?


– Eating has improved

– Eneregy has improved

– Gym motivation improved *gaining more mass and (cannot say I have lean muscles yet that is all depending on your eating habit). No product will work magically, you have to put your time into it. People always think a product will work magically. Answer is NO, this product enhances your natural hGH and the rest is up to you. Eat Clean, go to the gym and use this product for 30 days and it will work for you. That’s my two cents.. – Brava

The its Ok. For Girls??

I would think it is safe for women. I don’t take Growth Factor-9, but I have been taking SeroVital-hgh for the past 4 months. The ingredients and claims are identical (you can look this up for yourself to confirm and SeroVital is marketed almost exclusively to women). The only difference I see is that SeroVital instructs users to take all 4 capsules at least two hours after eating and waiting at least two hours before their next meal. I simply take them first thing in the morning and don’t eat until late-morning or early-afternoon. I hope this is useful.

I just got my shipment of serovital in the mail today so you’ve been on it for 4 months, how do you feel about it?

I am a woman& I have been taking AntiViral-huh for a month & a half now. It has the same amino acids in it, from what I read quickly. I KNOW it’s for women too, so I would assume the same is true here, but don’t know. I was already lean & thin. I am an avid swimmer. I don’t wa t to guess about possible results, but I have gained a few pounds, which is fine with me. It’s partly hormonal, and either fluid or muscle. Not sure, but I kinda wanted a little more more on me, as I’ve been too thin in the past. But I feel pretty good, so far & enjoy my swims. My mental clarity has actually I.proved, as these are many of the same recommendations for brain function. My dad is in late stage Alzheimer’s, so I’ve done my homework, since it’s avoidable, but not curable yet. Scientists, like in, “Grain Brain”, say “it’s just Diabetes 3”. So, I will be taking these supplements anyway, which are found in some specific brain supplements. I figure I might as well take them in a form that may benefit me otherwise. For that reason alone, I recommended considering a supplement like this. I have some other health concerns I am hoping to see improvement too.

I been taking growth factor 9 for a few weeks and noticed a difference. I Feel stronger. I benched 155 before taking them now I bench 280. I also see a difference in my appetite I eat less now. I take four in the morning and im not hungry till 5pm.

Quit your lieing dexter

LOL. Last comment was funny.

However I’m taken this and it works. Price tag is a bit high but I do feel a difference. My mood changes, I intend to eat less