Heel spur and supplements
There are some rare cases of patients that have benefitted from supplements. No real hard scientific facts, and a similar number of patients have had no gain whatsoever using them, so I won't go into too much detail here.
Generally speaking it is assumed that one of the causes for heel spur/plantar fasciitis is a lack of high-quality calcium. Taking calcium tablets could be a solution then. Also some homeopathic pills are sometimes mentioned.