Remove Spider Veins with Insulin Syringes and Saline Solution?

Noooooo! Not only would you be exposing your body to potential infection as well as to dangers inherent in using non medical-grade saline (an endless array of potential impurities and concentration disparities), but, you'd also be performing an ineffective technique.

Unless the deeper, reticular network of veins supplying the spider veins are treated at the same time, the spider veins will likely recur over time. Furthermore, if one or more of the valves within the deep veins is incompetent, this problem must be fixed before any lasting results from spider vein treatments can be achieved.

Finally, (hypertonic) saline injections are painful. There are better options for sclerotherapy solutions (i.e. foam preparations of sodium tetradecyl sulfate and/or polidocanol) that are not only significantly less painful, but, also are just as - if not more - effective than hypertonic saline.

On a side note, despite the popularity in the past of using hypertonic saline as the solution ("sclerosant") in sclerotherapy, it is actually not FDA-approved for this purpose. Both sodium tetradecyl sulfate and polidocanol are FDA-approved for this indication.

You should never treat yourself with sclerotherapy.  The solution used for sclerotherapy is not .9ns but hypertonic saline which is caustic and carries many potential risks.

Please NO!!  Vein disease is a real, progressive disease and before any treatments commence you should have a thorough evaluation of your circulation to see if there are underlying deeper veins that are forcing blood to the surface creating these veins.  Only a board certified surgeon trained in phlebology should evaluate you and then choose the best treatments for you so that you can manage this disease optimally.  Saline is not going to treat the veins as well as modern medicines such as polidocanol or Sotradecol.