Buoy Hydration Drops Review: Minerals, Cost and Evidence

Buoy Hydration Drops are a small-dose, unsweetened electrolyte supplement you add to a drink. Their clearest advantage is a flexible liquid format. The important limits are the modest amount of each mineral per squeeze, the difference between a serving and a day's use, and evidence that is much narrower than the brand's broad wellness language. This review covers the regular Hydration Drops, not Rescue Drops or Digestion Drops. ¹

What is in a serving?

One short squeeze is 1.5 milliliters. It supplies 50 milligrams of sodium, 80 milligrams of chloride, 10 milligrams of potassium, and 0.5 milligrams each of magnesium and calcium. A bottle contains 40 servings. The label also lists vitamins B1, B5 and B6 and a proprietary trace-mineral blend, rather than individually quantified amounts of every advertised trace element. ¹

That profile is more useful than the number of minerals in the marketing headline. If you need a particular amount of sodium or magnesium, compare that actual amount with your plan rather than assuming that a long ingredient list provides a large dose. Five servings, for example, provide 250 milligrams of sodium but only 2.5 milligrams of magnesium: this is not a substantial magnesium supplement. ¹

Other ingredients include purified water, citric acid and a botanical antioxidant blend. “Unflavored” does not mean that water and salt are the only ingredients, or that every person will find the drink tasteless. Buoy itself acknowledges a subtle mineral taste. Ingredient preferences are a legitimate reason to compare products; sweeping claims about other sweeteners or flavors are not needed to make that choice. ¹

How long does the pack last?

Buoy directs use in four to seven full drinks daily. The three-bottle pack contains 120 servings, so it lasts 30 days at four servings daily and about 17 days at seven. A “one-month supply” therefore depends on how often you use it. Check your remaining bottles before accepting a fixed delivery interval. ¹

The product page displays $30.03 for the default three-bottle subscription with free monthly shipping, compared with a $39 one-time purchase plus $9 shipping. That is about 25 cents per serving on subscription, but approximately $1 to $1.75 daily at four to seven servings. Compare the full daily use and shipping cost, not just the price of one squeeze. ²

The point is not that a higher daily cost makes the product poor value. A format you enjoy using can be worth paying for. The useful question is whether the convenience is worth that amount for your routine, especially when you already obtain fluids and minerals from ordinary drinks and food.

What the hydration research establishes

Buoy promotes a university-led study as support for its hydration claims. The accessible original report is a 2024 medRxiv preprint, explicitly identified as not certified by peer review. It tested 30 healthy adults aged 18–45 during short laboratory sessions at rest. The report also discloses Buoy support for a portion of two authors’ academic time. ^{3 4}

The report found improved short-term fluid-retention measures compared with water. However, Buoy and water were consumed over four hours, while the comparator electrolyte drink was consumed over 30 minutes. The authors acknowledge that ingestion rate and beverage composition could both explain differences. This does not establish better athletic performance, long-term symptom relief, or treatment of IBS, constipation or GLP-1 side effects. ⁴

A hydration-index result should be read as the outcome measured in that setting, not a percentage improvement in overall health. It also does not answer whether adding drops to every kind of beverage reproduces the study. We would keep expectations focused on an optional electrolyte addition rather than use a laboratory result as a promise of a noticeable daily benefit.

Is it an oral rehydration solution?

Do not treat a squeeze of sugar-free drops as interchangeable with an oral rehydration solution for illness. NIDDK describes those solutions as containing glucose and electrolytes and recommends replacing lost fluids during diarrhea. It also advises people with diabetes, kidney disease and certain other conditions to discuss the appropriate solution and fluid amount with their doctor. ⁵

That is a different decision from choosing an unsweetened drink additive. If symptoms or significant fluid loss are the reason for shopping, establish the replacement plan first. An electrolyte product name cannot tell you the required composition or quantity.

Our GLP-1 constipation guide explains why a persistent digestive problem needs more context than a hydration purchase. The GLP-1 food list also helps put drinks alongside meals rather than making supplements the entire nutrition plan.

Subscription and refund details

Buoy permits delaying or canceling subscriptions through its customer portal or help center. Its policy says an order cannot be canceled or modified once created; the reminder for the first recurring order can arrive up to five days beforehand. Canceling a subscription affects future orders, not automatically one that has already processed. ⁶

The 30-day guarantee applies to a new customer's first order and must be requested within 30 days of delivery. Unopened items, including free gifts, must be returned using the supplied label and received within 30 days of authorization. Clothing and products discounted at least 40% are excluded; international refunds exclude shipping, taxes and duties. Outside the guarantee and damaged-goods policy, sales are final. ⁶

Our verdict

Regular Hydration Drops fit someone who wants an unsweetened liquid format and understands the modest per-serving mineral quantities. They are a weaker choice when the real goal is a substantial mineral dose, a medical rehydration formula or dependable relief of digestive symptoms. Match the label to your actual need, compare a day's cost and choose a delivery interval based on your own use rather than the pack's month-supply description.