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Muscle Factor X

Manufactured by Muscle Factor X, LLC, Muscle Factor X is claimed to reduce body fat, build lean muscle mass and naturally boost energy while raising metabolic rate and accelerating the body’s fat burning capability with just two capsules a day. A proprietary blend of all natural ingredients, the manufacturers claim that their product is also able to boost testosterone levels in males.

In this review, we will investigate how well Muscle Factor X works while looking at both the positive and negative aspects, before determining whether this is the product for you.

Muscle Factor X Review

Muscle Factor X Pros
  • Appetite suppressing qualities
Muscle Factor X Cons
  • Expensive
  • Lack of clinical testing
  • Mixed customer reviews

Muscle Factor X Review

A blend of all natural ingredients, Muscle Factor X promises to build muscle fast while helping you to lose fat quickly. The product website claims that its users can re-engineer their body within 30 days and expect to see a gain in energy; however, its claims have not been evaluated by the FDA.

Claimed weight loss benefits

Muscle Factor X claims to be a metabolism booster and fat burner.

How Muscle Factor X Works

The product website claims that Muscle Factor X works by naturally boosting testosterone, helping to build muscle, burning fat and providing the body with energy. It is also believed that Muscle Factor X is able to create a full sensation within the body meaning that users feel less inclined to eat, aiding weight loss.

For more information, we recommend you read our How does Muscle Factor X work article.

Key Muscle Factor X Ingredients


Caffeine in Muscle Factor XCaffeine starts the process of lipolysis meaning that fatty acid is released into the blood stream, becoming available for cellular uptake. Signals are sent to the fat cells, thanks to stimulation of the nervous system, so that fat is broken down. Caffeine is able to provide the body with bursts of energy and is thought to speed up metabolism.

For more information about the weight loss benefits of caffeine, we recommend you read our Caffeine – Weight Loss Benefits and Side Effects article.


L-arginine is thought to stimulate the growth hormones in the body as well as being converted into nitric oxide, which regulates the metabolism of fatty acids, glucose and glycogen.

Microcrystalline Cellulose

Microcrysalline Cellulose may be able to aid weight loss by absorbing moisture and expanding in the body, leaving users with the sensation that they are full meaning that they are likely to eat less as their appetite is suppressed.

For more information, we recommend you read our Muscle Factor X Clinical Studies article.


Weight Loss Power: 40/100

There is no evidence of any clinical evidence into the weight loss power of Muscle Factor X, and for this reason, there is no real way to know how well the product works. However, it does appear to be able to help break down fat and there are notions of appetite suppressing qualities.
Speed of results: 50/100

The product website claims that its users can expect to re-engineer their body within 30 days of using the product; however, there are mixed customer reviews as to how long the product takes to show results, with answers ranging from days to no results at all. Therefore, it is difficult to establish the speed of results.
Appetite Suppression: 60/100

The use of microcrystalline cellulose in Muscle Factor X suggests that the product does have good appetite suppressing qualities. The substance is believed to absorb moisture and expand in the body creating a sense of fullness and stopping users from eating so often.
Long Term Results: 30/100

As there is a debate as to how well the product works, it is hard to say how good the long term results are, especially with mixed customer reviews. See our top rated diet pills.
Safety: 50/100

There do not seem to be any safety concerns with Muscle Factor X, all clinical trials conducted on its ingredients deem them safe in moderation; however, there has not been any clinical testing on the actual product and ingredients could potentially negatively react with each other.
Value for money: 30/100

At £50 for a month’s supply, this is one of the more expensive supplements on the market. The fact that the product’s effectiveness has been questioned, and the lack of clinical testing surrounding the product would suggest that £50 is not a fair price.

Muscle Factor X Side Effects

Insomnia - Caffeine related side effectsThere is no mention of any serious side effects on the Muscle Factor X product website; however, there are known side effects to its key ingredients. Caffeine can cause sleeplessness, restlessness and rapid heartbeat as well as stomach upsets and nausea in some people. Breastfeeding and pregnant women are advised not to consume much caffeine. L-arginine is believed to worsen asthma attacks and allergic responses as well as causing the herpes virus to multiply and lowering blood pressure. Dipotassium Phosphate can irritate the digestive tract, often resulting in diarrhoea or constipation.

For more information, we recommend you read our Muscle Factor X Side Effects article.

Where to Buy Muscle Factor X

Muscle Factor X is not currently available to purchase from UK high street stores or from Amazon, however it is available from the product’s website and from eBay. The Muscle Factor X website sells the supplement for the equivalent of around £50 (plus shipping fees) per month’s supply and offers a 30-day money back guarantee. The price of the supplement on eBay may vary.

For more information, we recommend you read our Where to buy Muscle Factor X article. If you have bought Muscle Factor X, we would also recommend you read our How to use Muscle Factor X article.

Overall Verdict

At £50 for a month’s supply, Muscle Factor X is one of the more expensive supplements on the market. There has not been any testing of the product, which means that its true safety and effectiveness is unknown. There have been mixed customer reviews with some claiming that they have lost no weight and gained no muscle with Muscle Factor X but rather have experienced some uncomfortable side effects such as acne and bleeding gums. For these reasons, Muscle Factor X cannot be recommended as there are more affordable supplements on the market, which have been proven to be more effective.

If you are interested in who makes Muscle Factor X, we recommend you read our The Company behind Muscle Factor X article.

Overall: 43/100

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