hey, i have a question for some of you more knowledgeable types out there...i've noticed that people tend to throw out the old "use 400 mg of test a week" advice a lot, but is there any scientific basis for that? i know it works well for most people, but i think that might be way overkill for most people. i mean, males produce anywhere from 4-12 mg of testosterone a day, which would equate to 28-84 mg of test a week. i assume some of that floats around in the system for a while, but does anyone know how long, or know where to refer me to find out??
i pulled this excerpt form one of Cy's artivles, and didn't find the answers in there. btw, exactly how much is a ng/dl compared to MG's?
Testosterone (Free and Total)
This is of course the hormone that you should all be extremely familiar with as it's the name of this here magazine! Anyhow, just as some background info, about 95% of the circulating Testosterone in a man's body is formed by the Leydig cells, which are found in the testicles. Women also have a small amount of Testosterone in their body as well. (Some more than others, which accounts for the bearded ladies you see at the circus, or hanging around with Chris Shugart.) This is from a very small amount of Testosterone secreted by the ovaries and the adrenal gland (in which the majority is made from the adrenal conversion of androstenedione to Testosterone via 17-beta HSD).
Nomal range, total Testosterone:
Normal range, free Testosterone:
LH (Luteinizing Hormone)
LH is a glycoprotein that's secreted by the anterior pituitary gland and is responsible for signaling the leydig cells to produce Testosterone. Measuring LH can be very useful in terms of determining whether a hypogonadic state (low Testosterone) is caused by the testicles not being responsive despite high or normal LH levels (primary), or whether it's the pituitary gland not secreting enough LH (secondary). Of course, the hypothalamus ? which secretes LH-RH (luteinizing hormone releasing hormone) ? could also be the culprit, as well as perhaps both the hypothalamus and the pituitary.
If it's a case of the testicles not being responsive to LH, then things like clomiphene and hCG really won't help. If the problem is secondary, then there's a better chance for improvement with drug therapy. Increased levels can be indicative of hypogonadism, precocious puberty, and pituitary adenoma. Decreased levels can be indicative of pituitary failure, hypothalamic failure, stress, and malnutrition.
Follicular phase: 1.68-15 IU/L
Ovulatory phase: 21.9-56.6 IU/L
Luteal phase: 0.61-16.3 IU/L
Postmenopausal: 14.2-52.3 IU/L
With this being the most potent of the estrogens, I'm sure you're all aware that it can be responsible for things like water retention, hypertrophy of adipose tissue, gynecomastia, and perhaps even prostate hypertrophy and tumors. As a male it's very important to get your levels of this hormone checked for the above reasons. Also, it's the primary estrogen that's responsible for the negative feedback loop which suppresses endogenous Testosterone production. So, if your levels of estradiol are rather high, you can bet your ass that you'll be hypogonadal as well.
Increased estradiol levels can be indicative of a testicular tumor, adrenal tumor, hepatic cirrhosis, necrosis of the liver, hyperthyroidism, etc.
Follicular phase: 20-350 pg/ml
Midcycle peak: 150-750 pg/ml
Luteal phase: 30-450 pg/ml
Postmenopausal: 20 pg/ml or less