Nothing that I know of regarding the often over-the-top Terence McKenna, who I met about three years before his death.
As for Timothy Leary, who I not only met but hung out with a bit in the early 1990s (in fact, when the late Los Angeles Reader had turned fifteen years old in '93, Dr. Leary responded positively to my request to speak at our gala in downtown L.A.), Zen mentions a documentary that came out in the later 1990s, which chronicled his last years (and which I saw at an L.A. arthourse).
Zen also mentions a documentary about the still-living Dr. Albert Hofmann, which I would love to see (but cannot, since I don't get that channel).
Yes, Gordon, you are correct: Dr. Hofmann's creation has a certain specialness surrounding it. Dr. Hofmann originally synthesized LSD-25 in 1938, but, at that time, he did not see how it was important in his particular research. But, in 1943, he experienced a gnawing concern about that twenty-fifth compound, that he had missed something. And, sure enough, upon resynthesizing the stuff, he absorbed some through his hands and the results, shall we say, were, um, colorful. Then, just three days later, he tackled it again and -- viola! -- the most famous bicycle trip ever taken occurred.