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#Post#: 6312--------------------------------------------------
How Long is Growth Hormone Detected
By: Road2HardCoreIron Date: August 17, 2025, 9:35 am
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Taking exogenous growth hormone is the only effective way to
manage the debilitating symptoms of growth hormone deficiency
(GHD).
The serum GH levels will rise as soon as the first injection,
but it will take at least a month until you start noticing the
benefits of the therapy.
One of the first results you will experience is a reduction in
belly fat and a slimmer waistline. Patients also report improved
energy levels, increased lean mass, and higher bone density.
Usually, all symptoms of GHD disappear within the first year of
treatment.
Unfortunately, discontinuing the medications will cause your GH
levels to return to pre-treatment levels, and your symptoms will
likely follow.
Currently, there is no consensus on how long HGH therapy should
last. Therefore, you should always consult with an experienced
endocrinologist who will best determine the course of your
treatment and how long you should stay on HGH therapy.
What is the half-life of HGH?​
Injecting HGH under the layers of the skin (subcutaneously) is
the preferred method for administering growth hormone when
compared to intramuscular and intravenous injections.
Pharmacodynamics of growth hormone
That’s because subcutaneous injections prolong the growth
hormone’s plasma (circulating) half-life and allow for a single
injection a day. Trials reveal that the plasma half-life of
subcutaneous HGH injections is 7-10 hours.
In comparison, the plasma half-life of the naturally produced GH
in your body (or injected intravenously) is only 20 minutes.
Therefore, subcutaneous injections help mimic the natural
release of GH by the pituitary gland, which happens on several
pulses, mainly throughout the night.
How long does HGH take to work?​
Your serum growth hormone levels will start rising within
minutes after subcutaneous injection, but the increase will
gradually reach a peak 4 hours after the injection. Furthermore,
it will take 11-12 hours in total after the injection until your
plasma GH levels reach baseline values.
HGH works by binding directly to the growth hormone receptors,
which can be found in various tissues. The hormone triggers the
synthesis of IGF-1, which stimulates cellular and tissue growth.
This is why HGH therapy helps increase lean body mass, bone
mineral density, skin collagen, and hyaluronic acid levels, etc.
Furthermore, HGH directly stimulates enzymes in adipose tissue
that leads to the release of fat and the shrinking of fat cells.
Growth hormone also helps increase energy levels, boost mood and
improve sleep. The benefits of the treatment usually become
noticeable 1-2 months after the start of the therapy. Your body
will benefit from HGH injections for as long as the therapy
lasts, and there is no risk for developing a “tolerance”.
The risk of HGH side effects depends on the dose. The most
common side effects include symptoms of water retention such as
carpal tunnel syndrome, achy joints, and edemas.
These adverse reactions last only for a few weeks or until your
body adapts to the new GH levels. In fact, they can be avoided
completely by gradually increasing the dose.
Growth hormone has anti-insulin effects, so HGH therapy
increases insulin resistance. These effects are also not
permanent, and research suggests that insulin resistance usually
goes back to normal within 3 months of therapy.
How long does HGH stay in your system?​
If you have taken an injection, HGH will remain in your system
for up to 48 hours until it is completely broken into different
by-products. There are 2 main tests that can detect the use of
exogenous growth hormone – the isoform test and the biomarkers
test.
How long can HGH be detected?
GH isoform test​
The isoform test can detect the use of HGH within the first 48
hours and works by comparing the ratios of the different forms
of the hormone in your body.
HGH injections contain growth hormone that is identical to the
main type of HGH produced in humans, so a simple test of serum
growth hormone levels won’t be effective.
Yet, this is not the only type of growth hormone which your body
produces. There are other forms produced in the human organism,
and your body maintains a balance between the different types.
That’s why the isoform test uses the ratio between the other
types of growth hormone produced by your body and the one that
can be both produced endogenously or injected. Changes in that
ratio cannot occur naturally and indicate the use of exogenous
HGH.
HGH Biomarkers Test​
The biomarkers test can detect by-products of HGH, which occur
at least 48 hours after injection. Thus, the test is effective
in detecting exogenous growth hormone from 48 hours to 3 weeks
after injection.
Despite the fact that some amounts of the medication remain in
your body for up to 48 hours, GH levels usually return to
pretreatment levels within 12 hours of the injections.
There are no medications that may interact with the metabolism
of HGH or speed up its elimination. On the other hand, HGH may
increase the activity of liver enzymes and speed up the
metabolism of all medications metabolized by the cytochrome P450
family of enzymes.
On the other hand, it takes much longer for IGF-1 levels to drop
since its half-life is 20-30 hours. Thus it may take up to a
week before IGF-1 levels drop after discontinuing HGH therapy.
What happens when you stop taking HGH?​
HGH therapy can be discontinued at any time, but doing so will
likely cause your symptoms to reappear.
What happens if you stop taking HGH?
Adolescents and young adults who discontinue growth hormone
therapy experience a decrease in their metabolic rate as soon as
2 weeks after discontinuation.
However, it takes several months until symptoms reappear. The
first symptom to reappear is fat gain, more specifically,
increased adiposity around the waist. Due to the growth hormone
effect on metabolism, adolescents gained 4.3% of body fat on
average in a year.
Children who haven’t reached a final height and stopped taking
HGH therapy may also experience an increase in body fat.
Unfortunately, their linear growth will stall, and they may not
reach a normal adult height unless they resume therapy before
the end of puberty.
Another study in adults reports that discontinuation for longer
than 3 years also leads to unfavorable changes in bone mineral
density and blood cholesterol levels. Furthermore, the younger
adults in the study lost body mass while gaining body fat which
may indicate loss of lean muscle. The benefit that lasts the
longest after discontinuing HGH therapy is increased bone
mineral density. Yet, no benefits are permanent.
Long-term HGH therapy will not suppress your endogenous
synthesis, and your serum GH levels will return to baseline
after discontinuing growth hormone treatment.
How long does HGH withdrawal last?​
Research reveals that patients with severe GHD are most likely
to experience withdrawal after discontinuing HGH. The symptoms
of HGH withdrawal included decreased energy, and increased
tiredness, pain, irritability, and depression.
These complaints occurred within the first 3 months of
discontinuing HGH injection. In addition, symptoms of GHD also
contribute to these and more complaints, such as weight gain,
muscle loss, osteoporosis, and chronic fatigue.
It is difficult to estimate how long the symptoms of withdrawal
last since they overlap with the signs of severe GHD. Lack of
growth hormone can also lead to severe fatigue, depression, and
cognitive problems.
Decreasing the dose of HGH more slowly rather than quitting it
cold turkey may cause the symptoms of GHD to appear more
gradually. But the only way to prevent any symptoms of GHD from
reappearing is to continue taking HGH injections under medical
supervision.
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