Product Description
Training. Nutrition. Sleep. Most endurance athletes have the first two dialed, but sleep is where the actual adaptation happens, and it's the one lever that gets the least targeted attention. Poor sleep doesn't just leave you tired. It blunts training adaptation, compromises decision-making, weakens immune function, and compounds across a training block in ways that no amount of extra mileage can offset. The pros know this. It's why sleep protocols are now standard practice at the professional level.
SiS Rest+ Juice is a clinically studied pre-bedtime juice sachet built specifically for athletes — combining tart cherry, glycine, tryptophan, 5-HTP, theanine, and magnesium in a single 55ml serving to help you fall asleep faster, sleep longer, and wake up actually recovered.
Six Ingredients for Better Nights – Each ingredient in Rest+ Juice targets a different mechanism in the sleep and recovery process. Tart cherry and cacao extract bring natural anti-inflammatory and relaxation compounds. Glycine — an amino acid that lowers your core body temperature to signal sleep onset — is paired with L-theanine, the calming compound found in green tea that quiets mental noise. Tryptophan and 5-HTP are the building blocks your brain converts into serotonin and melatonin, the hormones that regulate your sleep cycle. Magnesium rounds out the formula, supporting muscle relaxation and the nervous system wind-down that heavy training constantly depletes.
Proven To Improve Sleep – Rest+ Juice is backed by an internal clinical study. Consuming it prior to sleep was found to reduce the time it takes to fall asleep by 24 minutes, increase total sleep time by 22 minutes, and improve sleep efficiency by 2.4% compared to a placebo. For athletes stacking hard training days, those 22 minutes of extra sleep matter.
Versatile by Design – The 55ml sachet mixes into cold water, warm water as a pre-bed tea, a smoothie, or straight into a post-workout recovery shake. It's one of the few sleep supplements that works as both a standalone bedtime drink and a recovery shake add-in — which makes it easy to build into an existing routine.
How to Use SiS Rest+ Juice
Timing: Consume one 55ml sachet 30–60 minutes before bed. This gives the active ingredients time to begin working through your system before sleep onset.
How to Take It: Add to 200ml of cold water for a pre-bed drink, or mix with hot water to make a calming tea. Also works blended into a recovery shake, smoothie, or yogurt for a combined protein + sleep protocol.
Frequency: Daily use during heavy training blocks, training camps, or race week delivers the most consistent benefit. It's especially useful when late evening training sessions make winding down difficult.
- Nut free
- Sport Tested: Informed Sport
Supplement Facts
Berry / Single
Serving Size: 1 Gel
Serving Per Container: 1
| Amount Per Serving | ||
|---|---|---|
| % Daily Value* | ||
| Energy (kcal) 36 | ** | |
| Fat 0.12g | ** | |
| of which saturates 0.06g | ** | |
| Carbohydrate 5g | ** | |
| of which sugar 5g | ** | |
| Fiber 0.05g | ** | |
| Protein 3.7g | ** | |
| Salt 0.06g | ** | |
| Cherry Juice Concentrate 13000mg | ** | |
| Glycine 3000mg | ** | |
| Magnesium 300mg | ** | |
| Cocoa Extract 250mg | ** | |
| Cherry Extract 220mg | ** | |
| Tryptophan 200mg | ** | |
| Theanine 200mg | ** | |
| 5-HTP 100mg | ** | |
* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
** Daily Value (DV) not established
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We do not accept returns on food items that have been opened, but we will issue a store credit if you are unsatisfied. In the event of a return, you must first contact us before sending back a return shipment.
Consumable products over $40 receive a 50% store credit. This includes specialty nutrition products such as ketones or supplements/vitamins.
SiS Rest+ Juice FAQ's
Everything you need to know about SiS Rest+ Juice.
Standard melatonin supplements add melatonin directly, which can suppress your body's own production over time. Rest+ Juice uses tryptophan and 5-HTP — the building blocks your brain naturally converts into serotonin and melatonin — so it supports your body's own sleep hormone production rather than replacing it. The formula also addresses sleep from multiple angles simultaneously: relaxation, core body temperature, mental calm, and muscle recovery, not just the onset trigger.
Glycine is an amino acid that helps lower your core body temperature — a key physiological signal that tells your body it's time to sleep. Research shows glycine supplementation reduces the time it takes to fall asleep and improves sleep quality, particularly subjective feelings of freshness on waking. It's especially relevant for athletes whose body temperature stays elevated after evening training sessions.
5-HTP (5-hydroxytryptophan) is a naturally occurring compound that your body uses as a direct precursor to serotonin, which then converts to melatonin. At the doses used in sleep formulas like Rest+, it's well-tolerated and supports the sleep-wake cycle without the dependency concerns associated with sedative-based sleep aids. If you're taking any medication that affects serotonin levels, check with your doctor before use.
REGO Cherry Juice is a single-ingredient product focused on recovery — reducing DOMS, joint inflammation, and supporting sleep through Montmorency cherry's natural melatonin content. Rest+ Juice is a multi-ingredient sleep formula that builds on the tart cherry base and adds glycine, tryptophan, 5-HTP, L-theanine, and magnesium to target sleep onset, duration, and quality more directly. If recovery is the primary goal, REGO Cherry; if sleep quality is the target, Rest+.
Rest+ Juice is designed to support natural sleep quality rather than sedate. The ingredients work with your body's own sleep systems, so most athletes report waking feeling more rested rather than groggy. Unlike pharmaceutical sleep aids or high-dose melatonin, the formula doesn't produce a residual drowsiness effect — which makes it appropriate for regular use on training nights.