Blackstrap mollasses and ACV help with colour, yes, you are right Jenifer, dont know diatomaceous earth it is not sold here.
Headstand I wouldnt dare at my age, but just sitting, heaving head down and doing gentle massages and hair brushing are excellent for stimulation of blood circulation, with increasing capillary circulation on top of the head.
Nitric oxide promoters - Borax, ginko biloba, vit. B3 and even Zinc, as well as alkalinity supporters, such as potassium citrate, are likely to help hair regrowth.