Black henna can contain many things except henna. It is likely to contain indigo or other more permanent dyes and it's not safe, it can cause allergic reactions in many cases. Normal henna leaves a brownish color. I'm not sure where you are or what your means are but home hair dyes are a much better alternative.
Prior to the availability of the pure levothyroxine, desiccated animal thyroid extract was the only treatment for hypothyroidism. Today, some individuals prefer dessicated thyroid extract as a more natural thyroid hormone.
TSH is a rather simple hormone to understand since it only has one majore function, regulating the thyroid gland. TSH stimulates growth of the thyroid gland and also increases the amount of thyroid hormones secreted into the blood. The major stimulus for TSH secretion is a drop in blood thyroid hormone levels.