Prime Male vs ISA-TEST GF Testosterone Boosters Compared

prime male vs isa test gf

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Prime Male vs ISA-TEST GF

Well, it’s a day for the big guns. We mean our Prime Male vs ISA-Test GF review, as well as those gains you will get from a top T booster.

But which of these two products will be the most effective at boosting testosterone? You cannot just rely on reputation alone in this business. Having seen too many of the big companies putting out subpar products, it is clear that reputation goes a long way in terms of sales.

That’s not what we are interested in though, we are into quality over quantity. The reputation of Prime Male Vs the size and market share of ISA- Test GF makes this an intriguing comparison.

Both will be judged on how well they can give you the following:

  • More strength
  • Increased energy
  • Enhanced libido
  • Elevated mood

It is easier said than done, which is why we are here to really look closely at the ingredients in each, and the dosages.

Our T levels decline from around the age of 30 and do not stop for the rest of our lives. A scary thought? Maybe it once was, but now you can do something about it if you find an effective product.

Let’s start by getting to know each of the companies first.

Prime Male Vs ISA-Test GF: Who Makes These Testosterone Boosters?


Prime Male Testosterone Booster ReviewHere we have the UK based company behind Prime Male.

They have a very good reputation for delivery their natural ingredients and applying years of industry knowledge.

Everything that makes is to GMP standards and are made in an FDA registered facility.

We do like to see a company that has a money back guarantee, and the 60-day offer form Propura means you get to give their products a proper chance.

Too many only have a 30-day guarantee, or even less and this means you don’t really get to give a T booster the time it needs to take effect.

They ship worldwide and have an impressive endorsement from none other than Dolph Lundgren – Universal Soldier and Rock IV actor and martial artist!


isa test gfWith an impressive website that is as busy as it is vas, it is clear this is an industry giant that makes ISA- Test GF.

Based in the USA they have been going strong since 2001 and even have 4 x worlds strongest man Brian Shaw as one of their athletes.

In terms of customer service, we cannot see a money back guarantee, and they only offer a refund to first time purchase.

With a vast range of products, they do just about everything fro this T booster to fat burners, pre-workouts and beyond.

You can often tell the size of a company by the range of merch, and iSatori has bundles of it. They also have some pretty useful workout info as well.

Prime Male vs ISA-Test GF Ingredients

This is where we can get stuck in.

The problem though lies with ISA-Test GF, they use proprietary blends.

This means for many of the products (not all) we cannot see the dosages since many ingredients are bunched together into one new blend, with the overall dosage given. Individual ingredients are without their dosages meaning we cannot see how effective they are.

We will find out what we can though.

There is also the recommended serving suggestion. ISA-Test GF advises taking 4 capsules one hour before a workout, or the same but one hour before bed.

We prefer it when you can take a product 3-4 times a day to spread out the benefits.

Mutual Ingredients

Vitamin B6

A solid start from both here and this is an ingredient that it reduces the effectiveness of estrogen.

Since the female hormone is a known killer of your T, it is good to have much less of it in your system.

Low levels of B6 might even be related to low testosterone, so it is an important ingredient.

The 7.5 mg in Prime Male is an optimal dosage, as is the 7 mg in ISA-Test GF.


A solid start from both it seems.

Another good inclusion, this time because it reduces the effectiveness of SHBG (Sex Hormone Binding Globulin). This is important since it usually binds to your T and makes it unusable. Testosterone can thrive when it is not as effective.

The 300 mg in ISA Test GF and the 100 mg in Prime Male will do a good job.


As good as it gets for T boosting.

The truth is, your body cannot produce more T without it.

It even stops your body from depleting testosterone supplies during strenuous exercise. On top of all this, it also stimulates the luteinizing hormone which communicates with your testes to create and release more testosterone.

The 20 mg in ISA- Test GF is an optimal dosage as is the 30 mg in Prime Male.

Mucuna Pruriens

Another good ingredient, this one has a great reputation for boosting T.

It works by promoting HGH and provides general support for testosterone. It even blocks prolactin, a known killer of T so the less of this the better.

Prime Male have included 300 mg which is a very good amount. ISA-Test GF? Well, we are not sure since they have included it as part of a proprietary blend.

Individual Ingredients

Prime Male

D-Aspartic Acid

About as good as it gets really, such an important ingredient in a T booster.

It is another that triggers the luteinizing hormone so this equals more T. It also increases sperm count so it works for sexual health too.

Oh, and it also triggers the synthesis of the HGH.

The 1,600 mg in Prime Male is another optimal dosage.

Vitamin D3

One of the best ingredients going.

Low levels of this are linked to low testosterone so keeping it topped up is important.

Especially since many of us are deficient.

We actually create our own when our skin is exposed to direct sunlight but clearly, we aren’t getting enough rays.

The 5,000 IU included here is another optimal dosage.


Vitamin C

You will usually see a T booster include it’s better ingredients at the top, for some reason they have gone for one of the most useless.

Sure, Vitamin C has some good overall health benefits, but in terms of boosting testosterone, it does nothing directly that warrants its inclusion.


Good to see a good ingredient.

Well, thought of as a libido enhancer it is also good for maintaining healthy insulin levels which is good news for testosterone.

Is there an optimal dosage here? We don’t know since it is part of a proprietary blend.

Prime Male Vs ISA-Test GF Side Effects

There is nothing that should concern the user in either product.

The proprietary blends are usually a concern, but since there aren’t any stimulants in there, it should be fine. As always check the label for allergies.

Prime Male Vs ISA-Test GF Pros and Cons

Prime Male Pros

  • Many top T booster ingredients
  • No side effects
  • Optimal dosages
  • Reputable company

ISA-Test GF Pros

  • Some decent ingredients
  • Big company

Prime Male Cons

  • Only available online
  • Some competitors have higher D-Aspartic Acid

ISA-Test GF Cons

  • Some ingredients underdosed
  • Proprietary blends
  • Too many ineffective ingredients
  • Suggested serving not ideal

Prime Male Vs ISA-Test GF Conclusion

Winner: Prime MalePrime Male Testosterone Booster ReviewBuy Prime Male from:

A close contest in some ways but really there was only one product that excelled when it came to the best ingredients for a testosterone booster and dosages and that was Prime Male.

ISA-Test GF was always going to be on the back foot when we saw they used proprietary blends, but the truth is they also had various pointless ingredient such as Tribulus which does nothing for your T.

Prime Male have stuck to effective ingredients and since we can see all the dosages, we can see it is a top testosterone booster.

We have no problem recommending this product because it is so effective, and the natural ingredients make it 100% safe.

To find out more about this excellent T booster, check out our in-depth Prime Male review.

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