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Sugar Defender and Antidepressants: The L-Tryptophan Question
Sugar Defender and antidepressants have never been tested together. The label lists L-tryptophan, which sources say not to combine with serotonin-raising drugs without advice, plus GABA and caffeine from guarana. We cannot call the mix safe or unsafe for you. Show the label to your prescriber or pharmacist before the first drop.
Written by the Sugar Defender label deskUpdated · 4 min read
Short answer01
Can you take Sugar Defender and antidepressants together?
Nobody has studied it, so no one can promise either way. The label warns only that you should consult your physician if you take any other medication.
What we can do is read the 23 lines and flag the ones a prescriber would ask about. Three stand out: L-tryptophan, GABA and guarana.
The flags02
Which label lines matter with antidepressants?
L-tryptophan is the main one, and the caps below come from the label order, not from a measured amount.
| Label line | At most per mL | Flag from the source |
|---|---|---|
| L-tryptophan (21st) | 9.5 mg | Not for use without advice alongside MAO inhibitors, tramadol, dextromethorphan, meperidine, sedatives or serotonin-raising supplements (Drugs.com, L-tryptophan) |
| GABA (19th) | 10.5 mg | Studied up to 120 mg a day for 12 weeks; may stack with blood pressure medicine (Oketch-Rabah et al., Nutrients 2021 (USP GABA review)) |
| Guarana (3rd) | 67 mg | Caffeine; may not be safe with other stimulants (MSKCC, Guarana) |
Check the arithmetic: 200 divided by the place number. These are ceilings for the blend, not readings.
L-tryptophan03
Why is L-tryptophan flagged with serotonin drugs?
Tryptophan is the raw material the body uses to make serotonin, so warnings focus on stacking it with drugs that raise serotonin.
The source we use names MAO inhibitors, tramadol and others. It does not list every antidepressant, so an SSRI or SNRI is a question for your pharmacist, not an assumption either way.
L-tryptophan also carries history. In 1989, contaminated supplements from one manufacturer caused an outbreak of eosinophilia-myalgia syndrome (NORD, Eosinophilia-Myalgia Syndrome). Sugar Defender's maker is not named on the label, which is one more reason to ask.
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 packsThe others04
Do GABA and caffeine matter with antidepressants?
They can matter, though the evidence is thinner than for tryptophan.
The USP review of GABA found no serious events at studied intakes, but it says combining it with blood pressure medicine could raise the risk of low blood pressure (Oketch-Rabah et al., Nutrients 2021 (USP GABA review)). Caffeine from guarana and green tea has no printed amount. People who feel jittery or anxious on caffeine can ask whether that adds to how their medicine feels.
Never pause or change an antidepressant because of a supplement. Mood medicines are adjusted by the prescriber, on a plan. Read the amino acid details on the amino acid page and the side-effects review.
Where can I order Sugar Defender?
If your prescriber clears it, Sugar Defender sells in three packs with a 60-day money-back guarantee.
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 packs| Pack | 2 bottles | 3 bottles | 6 bottles |
|---|---|---|---|
| Bottles | 2 | 3 | 6 |
| Total mL (servings) | 120 mL (120) | 180 mL (180) | 360 mL (360) |
| Price per bottle | $79 | $69 | $49 |
| Total | $158 | $207 | $294 |
| Days at the label's 1 mL a day | 120 | 180 | 360 |
| Per day at 1 mL | about $1.32 | about $1.15 | about $0.82 |
| Days as the order page counts | 60 | 90 | 180 |
| Per day on that count | about $2.63 | about $2.30 | about $1.63 |
| Shipping (US) | Added at checkout | Free | Free |
| Digital e-books | None | Two | Two |
| Guarantee | 60 days | 60 days | 60 days |
FAQ05
Sugar Defender questions people ask
What is serotonin syndrome?
It is a reaction to too much serotonin activity in the body. Warnings about L-tryptophan with certain drugs exist to avoid it (Drugs.com, L-tryptophan). Anyone who feels unwell after a new product should seek medical care.
Does GABA in a supplement interact with medicines?
Possibly. The USP review found no serious events at studied intakes, but it says use with blood pressure medicine could raise the chance of low blood pressure (Oketch-Rabah et al., Nutrients 2021 (USP GABA review)). Ask a pharmacist about your own list.
Is the L-tryptophan in Sugar Defender the 1989 recall product?
No link is known. The 1989 outbreak traced to one manufacturer's supplements (NORD, Eosinophilia-Myalgia Syndrome), and Sugar Defender's maker is unnamed. That gap is why a batch report would help, and none is published.
Who wrote this06
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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Check your medicines first, then pick a pack. Three or six bottles ship free in the US and cost less per bottle, and every pack carries the 60-day money-back guarantee.
- Secure checkout on the order page
- 60-day money-back guarantee
- Ships from the U.S.; free on 3 or 6
