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Sugar Defender Headache, Jitters or Trouble Sleeping: Possible Causes
A Sugar Defender headache has no confirmed cause, because no trial of the drops exists. Guarana and green tea add caffeine in an unprinted amount, ginseng can disturb sleep, and African mango lists headache among its reported effects. Jitters can also be a sign of low blood sugar, so tell a clinician about persistent symptoms.
Written by the Sugar Defender label deskUpdated · 4 min read
Possible causes01
What could cause a Sugar Defender headache?
Three ingredient groups could plausibly play a part: caffeine sources, ginseng and African mango. Nobody has measured that in these drops.
Guarana seeds contain caffeine, and common side effects include nausea and insomnia (MSKCC, Guarana). Green tea adds more. The label prints no caffeine amount, so you cannot add it up.
| Ingredient | Named in the source |
|---|---|
| Guarana | Nausea, insomnia; heartbeat changes at high doses (MSKCC, Guarana) |
| Panax ginseng | Insomnia is the most common side effect (NCCIH, Asian Ginseng) |
| African mango | Gas, headache, trouble sleeping (MSKCC, Irvingia gabonensis (African mango)) |
| Beta-alanine | Harmless tingling at single doses of 800 mg or more (NIH ODS, Exercise & Athletic Performance) |
How much02
How much caffeine could be in the drops?
Nobody can say, because the label hides it. FDA cites 400 mg of caffeine a day as an amount not generally linked to harm for most healthy adults (FDA, Caffeine: how much is too much?).
The whole blend is 200 mg per mL, shared by 22 ingredients, so guarana (third) holds at most 67 mg per mL. That ceiling includes everything else it contains. Add coffee, tea and energy drinks and your own total may matter more than the drops.
A suggestion, not a label direction: if sleep is the problem, a morning serving is one way to test it. Review how you feel, and use the side effects page for the wider list.
Not always caffeine03
Could jitters be low blood sugar?
Yes, they can be. Shakiness, dizziness, hunger and a fast heartbeat are standard signs of a low (NIDDK, Low Blood Glucose).
- Shaky or jitteryTrembling hands, feeling nervous
- Sweaty, chillsClammy skin out of nowhere
- Hungry, nauseousSudden strong hunger
- Dizzy, confusedTrouble thinking or speaking clearly
- Fast heartbeatPounding or racing pulse
15-15For many people with diabetes, a low is under 70 mg/dL. Take 15-20 g of fast carbohydrate (juice, glucose tablets), then check again in 15 minutes.
Call 911If someone with a low passes out, has a seizure or cannot safely swallow. Do not give food or drink to someone who is unconscious.
Signs and steps from NIDDK (NIDDK, Low Blood Glucose). Insulin, sulfonylureas and meglitinides can cause lows; supplements may add to them (ADA, Vitamins & Supplements).
That matters most for people on insulin or a sulfonylurea. Keep taking prescribed medicine, and tell your prescriber about symptoms rather than guessing at the cause.
Sugar Defender: from $49 a bottle60 mL · 2, 3 or 6 bottles · free US shipping on 3 or 6 · 60-day money-back guarantee
See packsIf it persists04
When should you get help or report a reaction?
Get medical care for severe or lasting symptoms. FDA says that after a serious reaction you should stop using the product and file a report (FDA, How to Report a Problem with Dietary Supplements).
FDA's public database lists two 2024 reports naming Sugar Defender, one citing a cardiac disorder and insomnia. A report does not prove the drops caused it (openFDA, CAERS reports naming Sugar Defender). Many online posts about side effects are anecdotes, not evidence.
If you decide05
What does Sugar Defender cost?
Three bottles cost $207 and six cost $294, with free US shipping on both; two cost $158 plus shipping.
Sugar Defender: from $49 a bottle60 mL · 2, 3 or 6 bottles · free US shipping on 3 or 6 · 60-day money-back guarantee
See packsFAQ06
Sugar Defender questions people ask
Does Sugar Defender cause trouble sleeping?
It might. Guarana brings caffeine and insomnia is a listed effect, and ginseng's most common side effect is insomnia (MSKCC, Guarana) (NCCIH, Asian Ginseng). No trial of the drops confirms it.
Do Kings Sugar Defender side effects match the original?
We cannot say. Kings Sugar Defender is sold under a similar name and we have not reviewed its label, so do not carry these notes over.
Why does my heart race after the drops?
Caffeine can cause a fast heart rate and palpitations (FDA, Caffeine: how much is too much?), and a low blood sugar can too (NIDDK, Low Blood Glucose). Fast heartbeat with chest pain, fainting or breathlessness needs urgent care.
Who wrote this07
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by Isugardefender, a Sugar Defender U.S. shop, not by the manufacturer or the distributor. We earn money when you buy through our order links.
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