BulkSupplements Glycine Powder is a one-ingredient 500 g bag with about 167 servings of 3 g each. At the reviewed $22.97 price, the label serving costs roughly 14 cents, which is the strongest part of the product’s case.
The clean ingredient list does not prove purity, and the small human sleep studies around 3 g of glycine do not justify calling it a dependable insomnia solution. This is best viewed as an inexpensive bulk amino acid for an informed buyer who wants a precisely measured amount and accepts the limits of the evidence.
FitnessVolt may earn a commission from purchases through our links. This research-based review covers ASIN B00EOXU0N6 and the current 500 g bag. We checked the manufacturer label, exact Amazon Creators record, and relevant human research. We did not taste, handle, mix, ingest, sleep-test, or laboratory-test the product.
BulkSupplements Glycine Powder, 500 g
About 167 ServingsA low-cost, one-ingredient glycine powder with simple 3 g serving math, balanced by limited sleep evidence and no lot report reviewed by FitnessVolt.
Pros
- About 167 servings in the 500 g bag
- Roughly $0.14 per 3 g serving
- No other ingredients listed
- Flexible powder format
Cons
- Needs an accurate scale or consistent measuring method
- Clean label is not proof of lot purity
- Sleep evidence is small and short-term
- Bulk pouch is less convenient than capsules
The Label and Cost Math Are Unusually Simple
The manufacturer lists one teaspoon, approximately 3 g, as one serving. A 500 g bag therefore contains about 166.7 servings, which the label rounds to 167. The other-ingredients line says none.
| Current snapshot | Amount | Calculated cost |
|---|---|---|
| One serving | About 3 g | $0.14 |
| 30 servings | About 90 g | $4.13 |
| Whole bag | 500 g / about 167 servings | $22.97 |
The exact Amazon Creators record showed $22.97 and In Stock on September 11, 2026. Dividing the price by 167 gives 13.8 cents per 3 g serving. At one label serving per day, the bag lasts about five and a half months. Those figures exclude tax, shipping, coupons, and product lost to spills or measurement variation.
“One teaspoon” is approximate because powders settle and household spoons vary. A small gram scale is the better tool when the exact amount matters. That is not a criticism unique to BulkSupplements; it is the practical tradeoff of a large loose powder.
Powder, Capsules, and the Real Convenience Tradeoff
Powder keeps the ingredient list and serving cost simple. It also asks the user to open a large pouch, keep moisture out, and measure every serving. Capsules reduce those steps but can require several units to reach 3 g, depending on the capsule size, and the shell adds another ingredient.
The 500 g bag is therefore best for regular home use. It is less convenient for a carry-on, office drawer, or bedside routine where spills matter. The low cost per serving only remains an advantage if the buyer can store and measure the bag consistently for months.
We did not taste or mix this powder. Glycine is often described as sweet and soluble, but those general characteristics cannot establish the flavor, texture, or residue of this exact lot in a particular drink. A buyer who needs a flavored product should choose one intentionally instead of assuming a plain bulk powder will disappear.
What the Sleep Research Can Actually Support
A small controlled human study examined 3 g of glycine before bedtime during restricted sleep. Participants showed improvements in some next-day fatigue and performance measures. The short experiment is interesting because its amount matches the product’s listed serving, but it does not establish glycine as an insomnia remedy or prove a durable benefit in a broad population.
Small sleep studies are especially vulnerable to overstatement. A positive result can justify further research and a cautious personal trial; it cannot promise that every buyer will fall asleep faster, stay asleep, or feel refreshed. The BulkSupplements bag was not the named intervention, and FitnessVolt did not test it.
Sleep timing, caffeine, alcohol, light exposure, stress, breathing disorders, medication, and schedule can matter more than a supplement. Persistent insomnia or severe daytime sleepiness deserves clinical attention rather than an endlessly growing supplement stack.
The cited sleep-restriction trial was extremely small: only seven participants were included in the reported analysis. Some subjective improvements appeared on the first day but not the third, while a vigilance measure improved on both days. That pattern is more nuanced than a headline claiming that glycine “fixes” sleep.
Glycine Has Roles Beyond a Bedtime Supplement
Glycine is an amino acid used throughout human physiology and is also obtained from food. Its biological importance does not prove that extra powder improves a particular outcome. “Your body uses it” and “this supplement helps” are separate claims requiring separate evidence.
This distinction matters because bulk ingredients invite many off-label narratives. The current product label establishes identity and serving size; it does not establish a medical benefit, anti-aging effect, or optimal bedtime dose. This review limits its evidence discussion to the small human sleep-restriction study it actually checked.
One Ingredient Is Not the Same as Proven Purity
The label’s simplicity is a real advantage: glycine is the only listed ingredient. It reduces questions about flavor systems, sweeteners, or capsule materials. It does not reveal the measured identity, potency, microbes, solvents, or elemental contaminants in the bag you receive.
BulkSupplements publishes quality and testing claims at the company level, but FitnessVolt did not review a lot-matched certificate of analysis for this exact package. Buyers who need documentation should ask for the report associated with the lot code and check the laboratory, test date, units, specifications, and actual results.
Our glycine supplement guide compares the broader category. The main reason to choose this exact item is bulk value, not a special delivery system.
Who Should Buy It, and Who Should Skip It?
Buy it if you want a low-cost, one-ingredient glycine powder, are comfortable weighing loose powder, and understand that the sleep evidence is preliminary rather than definitive.
Skip it if convenience matters more than serving cost, you want a flavored drink, or you expect a certain sleep result. Capsules are easier to carry and count, although matching 3 g can require several capsules.
Pregnant or nursing buyers, children, people with a medical condition, and anyone using medication should ask a qualified clinician before adding a concentrated amino-acid supplement. Stop using it and seek advice if an unexpected reaction occurs.
Bottom Line
BulkSupplements Glycine Powder earns a 4.4 out of 5 editorial rating for its one-ingredient label, 500 g size, and unusually low cost of roughly 14 cents per 3 g serving. The value math is stronger than the efficacy case. It is a sensible bulk option for a careful buyer, but not proof of purity and not a demonstrated remedy for chronic sleep problems.
Sources
- BulkSupplements. (Accessed September 11, 2026). Glycine product page and current 500 g powder label.
- Bannai M, et al. (2012). The effects of glycine on subjective daytime performance in partially sleep-restricted healthy volunteers. Frontiers in Neurology.
