This is the last thing I will try to say on this subject, as I think the discussion has entirely run out of usefulness.
Here is Matt at his typically "buff" state:
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Is it possible he could get here without steroids if he has good genetics and training? Absolutely. But is it also possible he could have used a few cycles of testosterone to make it happen faster and easier? He would not be the first in Hollywood to do so.
I raised this possibility in the first case because cycles of testosterone could easily explain periodic fluctuations in his hair quality/density. As a man prone to male pattern baldness, every time he goes on cycle, even with finasteride, he will shed more, and when he stops, if he is treating it well and prone to good recovery on the meds (which it seems he is given his initial good response to the meds in the early 2000s), he will recover some as well.
This would potentially lead to a periodically fluctuating hairline and hair density over time, which we have seen.
Obviously, no one will know for sure except Matt and those close to him, but I think it's as good an explanation as any. Transplants don't vanish over the span of a few months and then reappear, and wigs are easily spotted under bright lights with hi resolution cameras. So those are less probable to me.
For the wig theory fans, I give you John Travolta's lace:
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This is what I mean about hi res photography. These were both an excellent hairpieces with excellent attachment, but under the bright lights and with a very good camera, one can easily zoom in and see the way light reflects off the lace. This is true of all lace pieces.
The only pieces which avoid this problem are thin skin V-Loop hairpieces, but they have a very clear "line" at their edge where they start and finish, plus hair direction through them is erratic as well, so they are easily identified too under harsh circumstances. They are also newer technology.
Matt has shown no evidence of any of these telltale signs of wigs or pieces at any time despite dozens/hundreds of red carpet appearances since he first started balding, so I do not think this is at all likely or probable as an explanation for his hair, and I return to the one I offered from the start.
Primarily, I believe he has had a fantastic result from the meds in the early 2000s. He has had very good styling from his team to help cover thin spots and make it look thicker when needed. Fluctuations we have seen could be explained by him going off the hair meds periodically and/or running testosterone cycles to "cheat" on his diet/exercise routine. And most recently, it is possible he may have had a recent transplant, but not likely before 2011 based on the picture posted earlier of what he looked like then.
This will all be speculation, and people will probably speculate until he dies. But I think that's as good an explanation as any, and it's the best I can provide.