@Strawberry - yes! It would! Mine is a multi-mineral salt, so it's multi-colored. It contains flecks of black salt, pink salt, etc. I initially bought it for culinary use, so I'm not actually certain of its composition the way I would be if I had bought it for medicinal purposes. However, I know it contains more than pure NaCl.
For mild POTS issues I just use a good pinch of each, Strawberry, like 1/16 of a tsp. For more severe POTS and / or crashing, I use 1/8 tsp of baking soda and two or three pinches of salt. Elsewhere you'll see 1/4 tsp baking soda, but if it's a crash, I drink it super-fast, and I don't want to achieve a paradoxical reaction by imbibing too much base too rapidly (your body produces more acid if you do).
If your crashes are brought on in part by increased lactate, I'd be cautious about putting anything acidic into the mix; although I have put a bit of homemade chai syrup in mine once or twice, which is mostly warming herbs like cinnamon, cardamom, and clove, and a little easily-absorbable sugar to steady myself. YMMV.
-J