P6 Ultimate Testosterone Booster Review – Is It Worth Buying?

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By Jack Cincotta, MS

Reviewed by Juliana Tamayo, MS, RDN - Last Updated

p6 ultimate testosterone booster review

Enhancing testosterone is one of the most talked about goals in the fitness industry, well… at least for men. And that’s why many men are looking to buy testosterone supplements to boost their manhood naturally. 

But with so many testosterone supplements out there that claim to boost T-levels, it’s hard to know which ones are the best, and which ones are simply overhyped garbage.

That’s why it’s important to really take a look at these supplements and see how effective they really are. And in this article, we’ll look at just one of these t-boosters called P6 Ultimate Testosterone Booster. 

Does it have the right ingredients? Will it provide the benefits you’re searching for? We’ll answer those questions and more in this P6 Ultimate Testosterone Booster review!

p6 ultimate testosterone booster

About P6 Ultimate Testosterone Booster

P6 Ultimate Testosterone Booster is one of a few products in the P6 line made by Cellucor, a company likely most well-known for their C4 product, as well as other supplements like Super HD and this one – P6 Ultimate Testosterone Booster. 

P6 Ultimate Testosterone Booster is designed to be a highly anabolic natural testosterone booster while also offering cognitive support and all-around male health support. 

It includes numerous patented and research-backed ingredients, such as KSM-66 ashwagandha, LJ100 longjack, Nitrosigine, and AlphaSize, all designed to help men look, feel, and perform at their best. 

P6 Ultimate Testosterone Booster Benefits

There are many different benefits that P6 Ultimate Testosterone Booster is designed to deliver, including:

  • Testosterone Boost
  • Cognitive Support
  • Enhanced Pumps
  • Increased Energy
p6 ultimate testosterone booster muscle pump

Testosterone Boost

P6 Ultimate Testosterone Booster is designed to, well, BOOST your testosterone levels and help you have better hormonal balance overall with ingredients like KSM-66 Ashwagandha, LJ100 longjack, and fenugreek. 

Cognitive Support

Testosterone kinda has a bad reputation as being the “bro” hormone. But make no mistake, its vital for cognitive function too. And P6 Ultimate Testosterone Booster is advertised to improve focus and overall cognitive function using ingredients such as AlphaSize. 

Enhanced Pumps

There are also a few ingredients in here designed to increase nitric oxide levels and give you better pumps, such as Nitrosigine and NO3-T. 

Increased Energy

Finally, P6 Ultimate Testosterone Booster is advertised to increase energy levels and help you smash through your physical and mental obstacles using a number of different adaptogens and other stimulating ingredients. 

On the surface, P6 Ultimate Testosterone Booster seems to be an all-around male enhancement formula. But can it really boost testosterone and overall vitality? Read on to find out.

P6 Ultimate Testosterone Booster Ingredients

P6 Ultimate Testosterone Booster comes in capsule form, with the serving size at a whopping 5 capsules.

So, there are many different ingredients in here, but they mostly are grouped into two blends: the P6 Testosterone and Performance Blend, and the P6 Ultimate Cognitive and Pump Blend. And then you also have vitamin D. 

p6 ultimate testosterone booster capsules

Vitamin D

There is a pretty loaded dose of vitamin D in here, which is essentially a hormone that plays a number of roles in the body. Related to hormonal health, it is involved in the synthesis of testosterone. 

And low vitamin D levels are a risk factor for low testosterone, so supplementation sometimes helps in people who have a deficiency. Vitamin D is also important for muscle and bone health and plays a role in athletic performance too. 

Recommended Dose: 2,000 to 5,000 IU

P6 Testosterone and Performance Blend

The first major blend in here is the P6 Testosterone and Performance Blend, which has KSM-66 ashwagandha, fenugreek, ovine placenta, Agaricus bisporus, stinging nettle, LJ100 Eurycoma longifolia, and 3,3’- diindolylmethane. 

KSM-66 Ashwagandha

KSM-66 is a trademarked form of ashwagandha root extract, and one of the most well-researched forms. Ashwagandha is an adaptogen that helps to reduce anxiety and stress. And research on KSM-66 shows that it can help increase testosterone, reduce cortisol, and improve strength, power, and endurance, while reducing fatigue. 

Recommended Dose: 300 to 600mg


Another herb included is fenugreek. Fenugreek has numerous components that act as prohormones, such as glycosides. Plus, it can inhibit aromatase and 5-alpha-reductase, which in turn can lead to less estrogen and more bioavailable testosterone. Overall, the research shows that fenugreek can improve testosterone levels in men. 

Recommended Dose: 500 to 600mg

Ovine Placenta

Certainly a unique ingredient in P6 Ultimate Testosterone Booster is ovine placenta powder, which comes from the placenta of sheep. It is said to be rich in growth factors, nutrients, and hormones, but no specific research has been done on it for testosterone production. 

Agaricus Bisporus

Also included is an extract from Agaricus bisporus, commonly known as button mushroom. Certain compounds in button mushroom act as aromatase inhibitors, which leads to a decrease in the conversion of testosterone to estrogen, leading to more bioavailable testosterone. 

Stinging Nettle

Another herb in P6 Ultimate Testosterone Booster is stinging nettle, which has many beneficial bioactive compounds. It also inhibits aromatase and 5-alpha-reductase, leading to less estrogen and more testosterone. 

Recommended Dose: 200mg

LJ100 Eurycoma Longifolia

LJ100 is a trademarked form of Eurycoma longifolia extract, also known as longjack or tongkat ali (we’ll refer to it here as longjack). Peptides and other compounds in longjack can stimulate the release of free testosterone from binding proteins. 

And longjack (including the LJ100 form) has quite a bit of evidence behind it showing that it can increase testosterone and sex drive, while also increasing energy and mood, reducing fatigue, and enhancing muscle mass, strength, and overall physical performance. 

Recommended Dose: 200 to 400mg


The final ingredient in this blend is 3,3’-diindolylmethane (DIM), which is a compound found naturally in cruciferous vegetables. It appears to help increase “good” estrogen metabolites while decreasing the bad ones, which could indirectly help testosterone levels and overall hormonal health. 

Recommended Dose: 150 to 200mg

P6 Ultimate Cognitive and Pump Blend

The other major blend in here is the P6 Ultimate Cognitive and Pump Blend, which consists of Nitrosigine, NO3-T arginine nitrate, AlphaSize Alpha-gpc, and Zembrin. 


Nitrosigine is a trademarked form of inositol-stabilized arginine silicate. In other words, it’s a form of arginine. And research on Nitrosigine shows that it can increase arginine levels for up to 6 hours after supplementation. And this also leads to improvements in nitric oxide, which increases blood flow and leads to more energy, better pumps, and even decreased muscle damage. 

Recommended Dose: 1,500mg

NO3-T Arginine Nitrate

Somewhat similar to Nitrosigine is NO3-T, which is a trademarked form of arginine nitrate. Ingesting nitrates also leads to increased nitric oxide, which enhances blood flow and leads to better pumps, more energy, better performance, and even enhanced recovery. 

Recommended Dose: 


Another trademarked ingredient in P6 Ultimate Testosterone Booster is AlphaSize, which is a form of alpha-GPC, a choline compound (got all that?). 

Alpha-GPC increases acetylcholine levels, which can not only improve focus and cognitive function but also muscular contractions and power. 

And specific research on AlphaSize shows it can increase strength and power in some cases. 

Recommended Dose: 500 to 600mg


The last ingredient in P6 Ultimate Testosterone Booster is Zembrin, which is a trademarked form of an extract of Xceletium tortuosum, or Kanna. In general, Kanna has bioactive compounds that can increase serotonin and can improve mood while reducing depression, anxiety, and stress. 

And Zembrin has been shown to improve mood and reduce anxiety while also reducing muscle soreness, likely from its anti-inflammatory effects. 

Recommended Dose: 25mg

Does P6 Ultimate Testosterone Booster Work?

P6 Ultimate Testosterone Booster should be a pretty good testosterone booster and overall male enhancement formula. 

p6 ultimate testosterone booster male formula

The best part about it is the many well-researched ingredients they use, a lot of which are trademarked forms that have been used in human studies. 

And you’ve seen how a lot of these ingredients can increase free testosterone, decrease estrogen, and promote overall hormonal health. KSM-66, fenugreek, and LJ100 are easily the best t-boosting ingredients in here, while white button mushroom and stinging nettle may provide a few more benefits. 

Plus, they use a lot of well-researched ingredients to increase blood flow and exercise performance, especially NO3-T and Nitrosigine. 

And AlphaSize and Zembrin are also pretty well-researched ingredients proven to enhance exercise performance and cognitive function. 

So, all good so far, right?

But the main issue is that these ingredients are all included in blends, so it’s impossible to see how much of each individual ingredient is in here. 

The total weight of the P6 Testosterone and Performance Blend is pretty good, but it’s still unclear how much of each ingredient you’re getting. 

And the P6 Ultimate Cognitive and Pup Blend is likely too low since Nitrosigine alone should be at 1,500mg but the total weight is only 1,225mg.

Overall, P6 Ultimate Testosterone Booster should definitely work, it’s just limited by lower-than-optimal dosages. 

Claims vs. Reality

So, what can you expect to get out of P6 Ultimate Testosterone Booster?

Well, I’d expect an improvement in testosterone levels and overall hormonal health, especially if you’re currently dealing with low T. 

This supplement might also improve cognition and even mood, but I can’t say exactly how much since they don’t list the doses of each ingredient. 

And you should get a decent increase in muscular pumps, energy, and exercise performance, but don’t expect anything crazy here. 

In sum, P6 Ultimate Testosterone Booster should give you a moderate boost in testosterone while also helping to increase your cognitive function, muscle pumps, and energy. 

p6 ultimate testosterone booster user

Who is P6 Ultimate Testosterone Booster Best For?

Due to its specific effects, P6 Ultimate Testosterone Booster is best for athletes and other highly active men who want a boost in testosterone while improving overall health, vitality, and energy levels. 

p6 ultimate testosterone booster

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P6 Ultimate Testosterone Booster

  • Formula includes vitamin D, fenugreek, KSM-66 ashwagandha, and more
  • Made in an FDA-approved and cGMP-certified facility
  • Benefits testosterone, cognitive health, pumps, and energy

Is P6 Ultimate Testosterone Booster Safe?

Some possible side effects of P6 Ultimate Testosterone Booster include:

  • Nausea, vomiting, bloating, diarrhea, and other digestive symptoms
  • Drowsiness
  • Headaches
  • Dizziness
  • Itching
  • Skin rash
  • Insomnia

Also, P6 Ultimate Testosterone Booster is manufactured in an FDA-approved and cGMP-certified facility. 

Where to Buy P6 Ultimate Testosterone Booster

You can buy P6 Ultimate Testosterone Booster on Cellucor’s website at this product link

cellucor p6 ultimate testosterone booster website

There are 30 servings (150 capsules per bottle). The regular price is $159.99 ($5.33/serving), or you can save 30% by choosing the Subscribe and Save option, which lowers it down to $111.99 ($3.73/serving)

If you choose the Subscribe and Save option, you can get it delivered every 2, 4, 6, or 8 weeks. And you only get 30% off the first order, with successive orders discounted at 20% ($127.99) ($4.27/serving)

So, this is clearly a crazy expensive product, and much more expensive than other testosterone boosters out there. I’m not sure why it’s this expensive since the doses aren’t anything spectacular. It’s a good product, but I’m surprised it costs this much. 

Final Verdict: P6 Ultimate Testosterone Booster Review

P6 Ultimate Testosterone Booster is filled with well-researched ingredients proven to boost testosterone, enhance energy and focus, and increase muscular pumps. Plus, many of the ingredients are trademarked forms. 

And while its lack of transparent dosages and really high price tag make us a little hesitant, we still think it’s worth trying out as a testosterone booster for those who can afford it. 

Overall Rating:
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Jack Cincotta, MS

Jack Cincotta is a certified holistic health coach through AFPA and a board-certified holistic health practitioner through AADP. He has written hundreds of articles on nutrition and supplementation. Jack has a M.S. degree in Psychology and is passionate about researching the science behind nutrition. He often uses research-backed supplementation protocols for many of his clients to optimize results.