How to calculate half lives
Basically every drug has a half live, 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 live
of Deca. The half live 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, . 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 live's.
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While we don't condone the use of steroids, we do try to put the best information out there for those individuals who have made the choice to use steroids as part of their bodybuilding regime. Please be aware there are a many number of negative side effects caused by using steriods. One of our most frequely asked questions is how to minimise hair loss. Steroids can cause an increase in DHT; this is the main hormone respomsible for thinning hair and causing hair loss. There are pharmaceutical treatments available that block DHT, such as proscar. One of our top picks for thinning hair is to use some of the best hair thickening shampoo for men or some of the best shampoo for thinning hair .
Dutasteride was patented in 1996  and was first described in the scientific literature in 1997.  It was approved by the FDA for the treatment of BPH in November 2001 and was introduced into the United States market the following year under the brand name Avodart.  Dutasteride has subsequently been introduced in many other countries, including throughout Europe and South America .  The patent protection of dutasteride expired in November 2015 and the drug has since become available in the United States in a variety of low-cost generic formulations . 
Admission (for men):
For medical purposes, the maximum dosage is 200 mg per day. The usual dose to improve the physique is 200-400 mg per day, for 6-12 weeks. This level is sufficient for a sensitive anabolic effect, although it is not necessary to expect a large increase in mass. At high dosages, 600 mg or more, the side effects will be too noticeable. Primabolan is good for drying. Primobolan because of its moderate nature is usually used in combination with other drugs. On drying, it is combined with halotestin or trenbolone. This combination increases the volume and improves the appearance of the muscles. Combinations of non-aromatizing drugs are popular among competing bodybuilders. It is also combined with testosterone or boldenone on mass-gathering courses.