Which of the following causes hair growth to speed up?

None of them force hair to grow faster. However, Biotin is good for the health of the hair (as well as skin and nails) and some people notice that their hair grows faster while taking it (although it's normally just healthier... depends on the person) as does Silica. Fish Oil is good for the health of the skin, but not so much for the hair. Glucosamine and Chondroitin are both good for joint health, but have no significant impact on the hair at all. MSM helps nourish the connective tissues including joints and skin, but it might have a little impact on the hair because of the natural Sulfur content. I hope that helps!