Test Decanoate

Long. With an injection every four weeks trough levels rose with each injection, one week after the fourth injection the peak was 31 nmol/L and thus briefly above the normal range. In the phase IIb study trough levels were in the normal range with 4-week intervals and just below it with 6 weeks.

Not as a single ester. Decanoate is the longest component of a blend of four testosterone esters that has been approved since 28 February 1973 according to the UK product information. The registry has no trial with decanoate alone, only trials with this blend, most of them after approval. Everything here is the state of research, not a recommendation.

LH and FSH fell quickly and kept falling during use. Together with a progestin implant all 20 men had at most 1 million sperm per ml after 12 weeks, 80 percent had none. In the phase IIb study sperm counts and gonadotropins recovered in both groups after stopping.

Haemoglobin rose by 9 and haematocrit by 15 percent, along with body weight. One study was stopped after 12 to 18 weeks because some men had raised liver values. In the phase IIb study there were minor effects on weight and cholesterol, 14 men stopped because of a side effect.

For testosterone in general, yes. In a trial with five dose levels (with enanthate, the body's own production switched off) fat-free mass rose by 3.4, 5.2 and 7.9 kg in the three higher levels. Strength and haemoglobin rose with the level while fat mass and HDL cholesterol fell.

In a doping control study with a four-ester blend all esters were detectable in blood and detection time depended on the ester. Samples were taken over 60 days. Testosterone is banned in official competition.