Quick Answer
Yu Sleep combines ten ingredients in a single liquid serving: melatonin (0.9 mg), magnesium glycinate, GABA, L-theanine, apigenin, lemon balm extract, 5-HTP, red tart cherry concentrate, and vitamins B2 and B6. Rather than relying on one ingredient to do all the work, the formula splits the job — a modest melatonin dose to support sleep timing, several calming compounds to quiet a busy mind, and a couple of B-vitamins that support the body's own sleep-related chemistry. Below is what each ingredient actually is and how it's intended to help. For the bigger picture — including how these ingredients come together in practice — see our full Yu Sleep review.
Ingredients Covered on This Page
Yu Sleep's Full Ingredient List at a Glance
Yu Sleep discloses the amount of one ingredient directly on the label — melatonin, at 0.9 mg per serving — while the rest of the blend is listed by name without individual milligram breakdowns, which is common for multi-ingredient liquid formulas but still worth knowing before you order.
| Ingredient | Category | Primary Role |
|---|---|---|
| Melatonin | Hormone | Sleep-wake timing signal |
| Magnesium Glycinate | Mineral | Nervous system relaxation |
| GABA | Amino acid | Calming, inhibitory signaling |
| L-Theanine | Amino acid | Calm without drowsiness |
| Apigenin | Flavonoid | Mild calming support |
| Lemon Balm Extract | Herbal extract | Stress and mood support |
| 5-HTP | Amino acid derivative | Serotonin/melatonin pathway support |
| Red Tart Cherry Concentrate | Fruit extract | Natural melatonin source |
| Vitamin B6 | Vitamin | Serotonin/melatonin conversion cofactor |
| Vitamin B2 | Vitamin | General energy and nervous system support |
Melatonin (0.9 mg)
What it is?
Yu Sleep's melatonin dose is set at 0.9 mg per serving — noticeably lower than the 5 to 10 mg found in many pharmacy sleep tablets. Melatonin is a hormone the body already produces to help signal that it's time to wind down for the night.
How it's meant to help? A lower dose is intended to nudge natural sleep-wake timing rather than override it, which is the reasoning some formulators use for avoiding the grogginess more commonly reported at higher melatonin amounts.
Magnesium Glycinate
What it is?
Magnesium glycinate pairs magnesium with the amino acid glycine, a combination generally considered one of the gentler, better-absorbed forms of magnesium compared with some other magnesium compounds.
How it's meant to help? Magnesium plays a role in normal nervous system and muscle function, and glycine itself is associated with a calmer, more settled feeling in the evening — a reasonable pairing for a nighttime formula.
GABA
What it is?
GABA (gamma-aminobutyric acid) is the brain's main inhibitory neurotransmitter — in simple terms, it's part of the system that slows things down rather than the one that ramps things up. Whether GABA taken orally crosses into the brain effectively is genuinely debated among researchers, which is worth knowing rather than glossing over.
How it's meant to help? It's included specifically for the racing mind at bedtime problem, aiming to support a calmer mental state going into sleep rather than targeting sleep timing directly.
L-Theanine
What it is?
L-theanine is an amino acid naturally found in tea leaves, best known for being associated with a calm, clear-headed state rather than sedation.
How it's meant to help? It's one of the more consistently discussed ingredients in this category for supporting relaxation without drowsiness, making it a natural fit alongside GABA and lemon balm in a wind-down formula.
Apigenin
What it is?
Apigenin is a plant flavonoid, also found in chamomile, which is where much of its reputation for gentle calming effects originally comes from.
How it's meant to help? It's included as one of the milder calming ingredients in the blend, intended to complement GABA and L-theanine rather than act as the formula's main active ingredient.
Lemon Balm Extract
What it is?
Lemon balm is an herb from the mint family with a long history of traditional use for easing stress and supporting a calmer mood in the evening.
How it's meant to help? It's positioned in the formula to help address the cortisol-and-stress side of bedtime difficulty, rather than the sleep-timing side that melatonin covers.
5-HTP
What it is?
5-HTP (5-hydroxytryptophan) is a compound the body can convert into serotonin, which is itself a precursor the body uses on the way to producing melatonin.
How it's meant to help? It's included to support the body's own serotonin-to-melatonin pathway rather than to add sedation directly.
Red Tart Cherry Concentrate
What it is?
Tart cherries naturally contain small amounts of melatonin and other plant compounds, and tart cherry concentrate is a common ingredient in sleep-support formulas for that reason.
How it's meant to help? It's included as a supporting, whole-food source of melatonin alongside the formula's main 0.9 mg dose, rather than as a headline ingredient on its own.
Vitamin B6
What it is?
Vitamin B6 is a B-vitamin the body needs as a cofactor for a number of processes, including the conversion of 5-HTP into serotonin.
How it's meant to help? Pairing B6 with 5-HTP in the same formula is a deliberate design choice, since B6 supports the exact conversion step 5-HTP is included for.
Vitamin B2
What it is?
Vitamin B2 (riboflavin) is a B-vitamin involved in normal energy metabolism and nervous system function throughout the body.
How it's meant to help? It rounds out the formula's nutritional side rather than acting as a primary sleep ingredient. One harmless side note: riboflavin can turn urine a brighter yellow — that's normal and not a cause for concern.
See the full label and official pricing below, or check our dedicated pricing breakdown for a package-by-package comparison.
Check Current Price →Ingredients FAQ
How much melatonin does Yu Sleep contain?
0.9 mg per serving — lower than the 5–10 mg found in many pharmacy sleep tablets.
Are all the ingredient amounts disclosed?
Only the melatonin dose is published on the label. The other nine ingredients are listed by name without individual milligram breakdowns, which is common for liquid multi-ingredient formulas.
Is Yu Sleep safe with antidepressants?
Not without medical advice first. The 5-HTP in Yu Sleep can interact with SSRIs, SNRIs, MAOIs, triptans and tramadol.
Is Yu Sleep a sedative?
No. It's formulated to support relaxation and normal sleep timing rather than to force sleep the way a sedative would.