Prohormone Terminology FAQ


Formally known as “Selective Estrogen Receptor Modulator”, a SERM is commonly used during the post cycle phase to regulate estrogen rebound and also normalize hormones.  SERMs are available by prescription or can be purchased online without a prescription from research chemical sites.


Stands for “Over the Counter” simply put, if it can be purchased legally from a store it’s OTC.


Also known as “Post Cycle Therapy” this is the period of time immediately after the steroid/pro-hormone cycle has ended, during this time users will begin to take supplements or medication to help their body return to normal hormone production levels.


Strong compounds that have well documented sides are usually referred to as being harsh.


Most commonly used to refer to estrogen rebound effects during the PCT phase, rebound can cause side effects such as gyno.  Therefore a proper PCT regiment should always be followed to limit estrogen rebound effects.


In the most simplistic sense a cycle is a word used to describe the period of time in which you will be taking a particular designer steroid/pro-hormone.  The term Cycle is used here as designer steroid/pro-hormone users typically (as they should) methodically plan their “time-on”.


Short for “Gynecomastia” is the development of abnormally large mammary glands in males resulting in breast enlargement.  Sometimes referred to as “man boobs” is a condition that can occur naturally (such as pubertal Gyno) however is also commonly associated with designer steroids/pro-hormones.  Gyno most often will happen during the  PCT phase due to estrogen rebound, however a properly designed cycle will provide adequate protection against gyno.


One of the most common side effects of designer steroids/pro-hormones back pumps in simple terms is cramping/tightness in the back, typically not painful but can be uncomfortable for some.  Users on cycle often supplement with Taurine which works well to reduce back pump occurrence.


The general term used for the wide variety of potential sides effects that can take place on cycle.


Refers to the length of time a compound remains in the system after taking a dosage.  Product half-life depends on the compound, for instance the popular designer steroid H-Drol has a long half life at around 12 hours.


Shelf life is the recommendation of time that products can be stored, during which the defined quality of a specified proportion of the goods remains acceptable under expected (or specified) conditions of distribution, storage and display.  Product shelf-life depends on the compound, for instance the popular designer steroid Epistane/Havoc has a very short shelf life and begins to lose effectiveness after six months of being stored.

UK prohormones and SARMs
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