BigTapp said:
So once you stop your cycle does all the hair you lose come back or is it a permanent loss?
The answer is yes and no...
There are two reasons a person could shed. One is traditional MPB. Here's the process that occurs: An androgen (typicaly DHT, but there are other strong androgens out there) attaches to receptors on the follacle. In turn, the follace attracts the ire of the immune system and is attacked. The follacle is weakened, can no longers support the hair, and sheds it. A new one will grow in its place, but this new hair will be smaller and less full. Now, as subsequent damage to the follacle is done, the hair gets smaller and smaller till it's fuzz -- then it's smooth.
Note that if you have MPB, you will lose hair in the predisposed areas -- it's just a matter of time. Since any androgen, not just DHT can tag these predisposed follacles for the immune system to attack, AAS simply help speed-up the process (sometimes dramatically).
The other reason you can shed is telogen effluvium (go google that for more). Normal hair follacles have a resting phase, a growth phase and a death phase. Sudden changes in hormone levels, stress levels and even certain vitamens can trigger something known as telogen effluvium. Instead of the normal 10% of hair being in the "death" stage at any time, a much larger percentage is driven to that stage. Hence, you shed. If the cause of shedding is purly telogen effluvium, then worry not, your hair will grow back.
Now here's the bad news... MPB and telogen effluvium aren't mutually exclusive. People can routinely suffer from both. As a matter of fact, telogen effluvium often occurs just before someone experiences a new wave of MPB.
So... how to tell the difference? Well, if it's telogen effluvium, when you pinch then pull hard on your hair, instead of getting 2-3 of the 25 hairs you'd normally get out (remember, 10% of your hairs are already "dead"), you'll get much more (i.e. 2x that number of hairs -- or more). Also, telogen effluvium tends to be a whole-scalp phenomenon. Therefore, if you are seeing thin spots and shedding in places not normally associated with MBP, you may be in luck.
And finally... be on the lookout for new hairs and watch their growth. A fully-healthy follacle will grow a hair around 1 cm/month (with pretty wide variances). If the hair looks feeble or stops growing -- you may be experiencing miniaturization (MPB process).