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In the context of biology and biochemistry, "half-life" refers to the time it takes for the concentration or amount of a substance (such as a drug or a peptide) to decrease by half. This concept is crucial in understanding how long a substance remains active or present in the body before it is metabolized or eliminated.


Peptides are short chains of amino acids that play various roles in the body, including signaling, hormone regulation, and as building blocks for proteins. Peptides can have different half-lives depending on their structure, composition, and how the body processes them.


The half-life of peptides can vary significantly. Some peptides have a short half-life, lasting only a few minutes to a few hours in the body before being broken down or cleared, while others have longer half-lives, lasting several hours to days.


For instance, in the field of medicine, researchers often modify peptides to increase their half-life by altering their structure or binding them to other molecules. This modification can enhance their stability and prolong their presence in the body, which can be beneficial for therapeutic purposes, like drug delivery or maintaining sustained effects of a medication.


Understanding the half-life of peptides is crucial for dosing schedules, determining the frequency of administration, and assessing how long the effects of a peptide-based medication or treatment might last in the body.
 
[h=2]STEROID HALF LIVES[/h]
STEROID HALF LIFE CHART
Steroid Half life's - anyone new to steroids may be wondering what this means, even some steroid users may also be wondering what this means. So here in simple terms you can read and hopefully understand all about steroid half life's and what this term means.
Basically every drug has a half life, steroids included. If for example, you were to inject 200mg of Decadurabolin once weekly, for 6 weeks, how would you know when you were "off"? Would you be "off" when you had finished your last dose? You would be able to calculate this from the half life of Deca. The half life of Deca is around 14 days. This means that 14 days from your last shot of 200mg of Deca, your blood levels of Deca will contain 100mg of the steroid. Another 14 days from then, i.e. 28 days from last dose, your blood levels will contain 50mg of the steroid. This amount then keeps halving every 14 days. Therefore you can clearly see that when you finish your cycle, even though you are not putting any steroids into your body, you may think that you are now "off", however you still have, and will still have for some time after your last dose, "active" blood levels of the steroid. Therefore you can plan what to use, how long for, and how long off your cycle, based on these half life's.

Below a list of half-life's of the most commonly used steroids, esters and ancillary compounds.

Oral steroids Drug Active half-life
Anadrol / Anapolan50 (oxymetholone) 8 to 9 hours
Anavar (oxandrolone) 9 hours
Dianabol (methandrostenolone, methandienone) 4.5 to 6 hours
Methyltestosterone 4 days
Winstrol (stanozolol)
(tablets or depot taken orally) 9 hours

Depot steroids Drug Active half-life
Deca-durabolin (Nandrolone decanate) 14 days
Equipoise 14 days
Finaject (trenbolone acetate) 3 days
Primobolan (methenolone enanthate) 10.5 days
Sustanon or Omnadren 15 to 18 days
Testosterone Cypionate 12 days
Testosterone Enanthate 10.5 days
Testosterone Propionate 4.5 days
Testosterone Suspension 1 day
Winstrol (stanozolol) 1 day

Steroid esters Drug Active half-life
Formate 1.5 days
Acetate 3 days
Propionate 2 days
Phenylpropionate 4.5 days
Butyrate 6 days
Valerate 7.5 days
Hexanoate 9 days
Caproate 9 days
Isocaproate 9 days
Heptanoate 10.5 days
Enanthate 10.5 days
Octanoate 12 days
Cypionate 12 days
Nonanoate 13.5 days
Decanoate 15 days
Undecanoate 16.5 days

Ancillaries Drug Active half-life
Arimidex 3 days
Clenbuterol 1.5 days
Clomid 5 days
Cytadren 6 hours
Ephedrine 6 hours
T3 10 hours

 
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