Muscle Sport Magazine

CYTOMIX (Liothyronine Sodium – 60mcg, Levothyroxine Sodium 20mcg)

Leigh Penman, MSM’s Resident Steroid Expert, Shares Her Knowledge

By Leigh Penman

CYTOMIX represents a very unique and highly effective approach to optimizing the functioning of the thyroid gland. The principle effect of thyroid hormones is to increase the metabolic rate and therefore enhance the burning of body fat for energy. In CYTOMIX you will find a very potent mix of T3 (active thyroid hormone) and T4 (inactive thyroid hormone).


Bodybuilders favor the use of thyroid hormones during contest preparation as they greatly assist the process of removing excess body fat. During strict diets when calories are reduced there is a corresponding reduction in thyroid activity, drugs such as CYTOMIX can alleviate this problem by supplying the body with an exogenous form of thyroid hormones and thus restarting the whole fat burning process.

CYTOMIX contains 60mcg Liothyronine Sodium (T3). Liothyronine Sodium has been shown to up-regulate beta-2 adrenergic receptors in fat tissue. When fat is broken down in the fat tissues of the body (a process known as lipolysis) and enzyme called Hormone Sensitive Lipase (HSL) plays a key role. In order for HSL to be activated epinephrine and norepinephrine (known as catecholamines) are required. These catecholamines bind to the beta-2 receptors and thus by adding T3 supplementation and subsequently up-regulating the beta-2 receptors there is a corresponding increase in HSL which leads to an increase in fat burning.

Although T3 is the active form of thyroid hormone, T4 (Levothyroxine Sodium) converts to T3 via your body’s natural metabolic pathways (which involves the action of an enzyme known as deiodinase). By supplying a small amount of T4 in this preparation you give your body the option of converting it to its active form should your body be able to utilize an additional amount. This also reduces the risks involved with over stimulating the thyroid by taking a full 80mcg of T3.


If you are not taking anabolic steroids when using thyroid medication your body may start to use muscle tissue for fuel. For this reason, thyroid supplements are usually the last thing added to a pre contest diet since it is the loss of stubborn body fat that is the prime objective and not the loss of lean tissue. You may also want to increase your protein intake as a further insurance policy against muscle wasting. It is also recommended that use of thyroid medication should not be more than six weeks in duration. The use of Clenbuterol with CYTOMIX is often recommended since Clenbuterol has mild anabolic properties and can spare muscle tissue. CYTOMIX is often alternated with Clenbuterol in order to maintain a fat burning environment in the body and avoid the inevitable tapering of Clen’s effects if it is used for long periods of time.

It should also be noted that CYTOMIX is a very powerful form of thyroid supplementation and dosage should not exceed one tablet a day. Which could be split to achieve two equal doses.

CYTOMIX and CLEN-40 (a very potent 40mcg Clenbuterol tablet) are available from

Leigh Penman, in addition to be a staff writer at MuscleSport Mag, has been writing for bodybuilding magazines, websites and nutritional supplement companies since 1985. Whilst residing in the UK, she earned the reputation of being one of the top female writers in bodybuilding-related media. Her credits included being a contributing editor on all the magazines in production as well as filling the shoes of Ladies Editor and Showbiz Editor on two publications (the later being on Arnold’s sanctioned magazine, ‘Bodypower’). During this time she also competed successfully on four occasions (placing in the top four in all contests).

Relocating to New York in the late 1990s she focused her writing attention to crystal healing techniques and metaphysics – however, she still maintained a five day workout schedule during this time and gained her personal training certificate.

Having also studied pharmacology in relation to sports performance, her writing began taking her in that direction until the present day which sees her embarking on a return to the magazine world, as well as extending her web-related work in the bodybuilding and fitness field.

Leigh has been working out for close to thirty years so she is clearly a writer who ‘walks her talk.’
She can be contacted personally at

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