Before looking up the other three you mentioned, Caroline....

I had damage to the Lateral Femoral Nerve from a C-section.
This is called Meralgia Paresthetica.

Here is a good explanation:
http://www.aafp.org/afp/2000/0401/p2109.html

There is a nice medical illustration (figure 2B) showing the two main nerves in the front of the body, and where they exit the abdomen.
The Lateral Femoral nerve exits along the side of the thigh, and is sensory only. It does not affect the strength of the muscles.

The femoral nerve carries both motor and sensory data.
http://teachmeanatomy.info/lower-lim...femoral-nerve/

Do you have any pain with your surgical injury? Or muscle weakness? If only numbness, then that would be something to live with. Many patients with MP get searing awful pain.... like I did. As nerves grow back any numbness may turn into unwanted and intermittent pain. They end up getting the Lateral Femoral Nerve severed, and when it grows back, the terrible stabbing lightning bolt pain returns.

So anyway....

1) the Sphingolin seems iffy to me and too risky. The bovine sources are often not identifiable as having Mad Cow. I believe a young cow was recently found with the disease. The Prions are difficult to find, and impossible to kill (instruments used on patients for open head surgeries, are thrown away... because they cannot be sterilized). I myself would never take any bovine or other animal organ derived supplement.

2) The Inosine seems low risk. There is a chance of raising uric acid (which causes gout), but that can be tested for with blood work.

3) The Flex NP has a boatload of Chinese herbs in it:
http://kirstinscounter.com/store/chi...s/flex-np.html
When using such a long list, it becomes impossible to know what may be helpful or not or interact with any RX medications you may be taking:
http://www.drugs.com/slideshow/herb-...eractions-1069
Besides, China has been sneaking drugs into its herbs to make them "stronger"... phenylbutazone is often found in herbs used for arthritis, Viagra in herbs for erectile dysfunction, and digitalis in cardiac products. So people need to beware of Chinese herbal products in general, IMO.

4) Nervagesic:
This link shows what is in this product:
http://www.mediherb.com/articles/L02...ostcardWeb.pdf

You can look up therefore the ingredients and check them out for interactions with your medications at this drug checker...
http://www.drugs.com/drug_interactions.html

While this drug checker is fairly complete, it is not 100% so and neither are any others. This topic is always changing and requiring updates.

WebMD now has some herbal and supplement monographs which are sometimes helpful.
http://www.webmd.com/vitamins-supple...ntname=inosine

As well the Maryland University Alternative site, can be useful too.
http://umm.edu/health/medical/altmed

Herbs are minidrugs...and some are quite potent. Just because they are natural is no guarantee they are all safe to use. Keep this in mind. People wanting to avoid Big Pharma...for toxicity reasons sometimes believe that all supplements are "better and safer" and this is just not true. There are risks on both sides of the fence.

One natural substance that is getting tremendous attention by the research community is Curcumin.
The newer highly absorbable forms that were used in studies are now available affordably OTC... like CurcuBrain by NOW and others. (these have the LongVida product in them currently.
I am using this and finding it helpful for my osteoarthritis, so you might want to try it too. I get mine on Amazon.