Safety
Side Effects of Nerve Supplements: What Each Ingredient Can Do
The side effects of nerve supplements depend on the ingredients. Acetyl-L-carnitine near 3 g a day can cause nausea, cramps and a fishy odor. Alpha-lipoic acid may lower blood sugar, with rare cases of recurrent lows. High vitamin B6 can itself injure nerves. Herbs add drowsiness, bleeding and liver cautions.
Written by the SciatiEase label deskUpdated · 4 min read
Ingredient list01
What are the side effects of nerve supplements?
Most are mild stomach or sleep effects, with a few serious exceptions.
A formula inherits the side effects of every line on its panel. Natural does not mean risk free (NCCIH, Using Dietary Supplements Wisely).
| Ingredient | What has been reported |
|---|---|
| Acetyl-L-carnitine | Nausea, vomiting, cramps, diarrhea, fishy odor near 3 g a day (NIH ODS, Carnitine) |
| Alpha-lipoic acid | Nausea, rash, lower blood sugar (Linus Pauling Institute, Lipoic Acid) |
| Vitamin B6 | Nerve symptoms with long, high intake (NIH ODS, Vitamin B6) |
| Feverfew | Stomach upset, rash, mouth ulcers, slower clotting (MSKCC, Feverfew) |
| Passionflower | Drowsiness, dizziness, confusion (NCCIH, Passionflower) |
| Chinese skullcap | Liver injury reports, bleeding risk (MSKCC, Scutellaria baicalensis) |
Rare but serious02
Which nerve supplement side effects are serious?
Low blood sugar, nerve symptoms and liver trouble deserve a call to your clinician.
Lipoic acid has been linked to insulin autoimmune syndrome, a rare cause of repeated low blood sugar (Vallianou et al., Metabol Open 2026). Vitamin B6 is the odd one: the nutrient is needed, yet Australia now requires a warning above 10 mg a day because of nerve reports (TGA, Vitamin B6 and neuropathy).
Shakiness or sweats with low sugar, new tingling or numbness, yellow skin or eyes, or an allergic rash.
Who should ask first03
Who is more likely to have trouble with nerve supplements?
People on blood thinners, diabetes medicine or chemotherapy, and anyone pregnant.
- Blood thinners: feverfew and skullcap may add to bleeding risk (MSKCC, Feverfew) (MSKCC, Scutellaria baicalensis).
- Diabetes medicine: lipoic acid may lower sugar further (Linus Pauling Institute, Lipoic Acid).
- Pregnancy: feverfew and passionflower are advised against (NCCIH, Feverfew) (NCCIH, Passionflower).
Keep taking prescribed medicine, and never change it because of a supplement.
SciatiEase: from $49.99 a bottle120 capsules · 1, 3 or 6 bottles · free US shipping on 3 or 6 · 180-day guarantee
See packsWhere to read more04
How do you lower the risk of side effects?
Start with the panel, tell your pharmacist, and stop to ask if something new appears.
Look for the B6 amount first. The B6, B2 and folate page explains SciatiEase's 20 mg. Our SciatiEase side effects page and medicines guide cover the formula itself, and the feverfew side effects and B6 neuropathy risk posts go deeper.
FAQ05
Nerve supplement side effects: specific questions
Can nerve supplements cause stomach upset?
Yes. Acetyl-L-carnitine near 3 g a day can cause nausea, cramps and diarrhea (NIH ODS, Carnitine), and lipoic acid can cause nausea (Linus Pauling Institute, Lipoic Acid). Taking capsules with a meal often helps.
Why does acetyl-L-carnitine cause a fishy smell?
A fishy body odor has been reported at doses of about 3 g a day (NIH ODS, Carnitine). It is tied to high doses, and a lower dose may avoid it.
Can lipoic acid cause low blood sugar?
It may lower blood sugar, which matters for people on diabetes medicine (Linus Pauling Institute, Lipoic Acid). Rare cases of recurrent lows from an immune reaction have also been reported (Vallianou et al., Metabol Open 2026).
Is the vitamin B6 in nerve supplements safe?
The upper limit is 100 mg a day in the US (NIH ODS, Vitamin B6), but Australia warns above 10 mg because of nerve reports (TGA, Vitamin B6 and neuropathy). Check the total from all your vitamins.
Do side effects of nerve supplements go away after stopping?
Stomach effects usually fade within days. Nerve symptoms from high B6 can take longer, so report them promptly. A clinician can tell whether a supplement is the cause.
Who wrote this06
Written and reviewed by
Pages built from the label, the brand pages and linked NIH, FDA, FTC, NICE and peer-reviewed sources.
Last updated . How we work: editorial standards and how we check reviews. This website is run by a licensed SciatiEase retailer, not by the manufacturer, SciatiEase Labs. We earn money when you buy through our order links.
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