After going vegan and consuming less iron, I didn't notice any slowing of hair growth while my levels were dropping over time. My hair grows about 10" a year still (I suppose genetics play a role here). I came across this a while back, perhaps it will be of interest to you.
Probiotic Bacteria Induce a ‘Glow of Health’
http://www.plosone.o...al.pone.0053867
Radiant skin and hair are universally recognized as indications of good health. However, this ‘glow of health’ display remains poorly understood. We found that feeding of probiotic bacteria to aged mice induced integumentary changes mimicking peak health and reproductive fitness characteristic of much younger animals. Eating probiotic yogurt triggered epithelial follicular anagen-phase shift with sebocytogenesis resulting in thick lustrous fur due to a bacteria-triggered interleukin-10-dependent mechanism. Aged male animals eating probiotics exhibited increased subcuticular folliculogenesis, when compared with matched controls, yielding luxuriant fur only in probiotic-fed subjects. Female animals displayed probiotic-induced hyperacidity coinciding with shinier hair, a feature that also aligns with fertility in human females. Together these data provide insights into mammalian evolution and novel strategies for integumentary health.
Ah. Probiotics are a confounder when considering the improvement in my skin since I've been taking C60.
So, here's a tip, in case you don't know it - there's only one probiotic that I'll bother with, since I'd rather not drink kefir and expose myself to dairy proteins.
VSL#3 is easily the best buy, best product available.
I can buy Jarrow probiotics for wholesale, delivered to my house.
But even at half price, if I buy Jarrow's best probiotic and try to equal what I get from VSL#3 at full retail, the Jarrow PB costs me at least 30% more - and VSL#3 has 7 published studies showing its effects on pathologies.
It gives you 450 billion organisms (or 900...) per daily packet.
Four days after I started taking it I could sing high notes again. I used to sing in bands and I would croak if I tried to hit the high notes I used to hit for the last 20-30 years.
It seems obvious that some bugs had infected my larynx and the PB's in VSL#3 kicked them out and boom - I could sing again.
It's amazing stuff!