A 90-capsule magnesium bottle lasts 90 days when the labelled serving is one capsule per day. The calculation is simple: divide the number of capsules in the bottle by the number of capsules used each day.
What matters is the product’s actual serving direction. A 90-capsule bottle does not automatically equal a 90-day supply if the label calls for two or three capsules per day.
How to calculate how long a supplement bottle lasts
Use this formula:
Capsules in the bottle ÷ capsules used per day = days of supply
| Capsules in bottle | Labelled capsules per day | Days of supply |
|---|---|---|
| 90 | 1 | 90 days |
| 90 | 2 | 45 days |
| 90 | 3 | 30 days |
This table explains the arithmetic only. Always follow the directions on the specific supplement rather than changing the dose to make a bottle last longer or finish sooner.
How long does Alurevia Magnesium Complex last?
Alurevia Magnesium Complex contains 90 capsules and its labelled use is one capsule per day. That makes one bottle a 90-day supply when used as directed.
Each capsule provides 500mg of elemental magnesium from eight named magnesium sources: oxide, glycinate, malate, taurate, citrate, carbonate, aspartate and orotate.
What does a 90-day supply cost per day?
At the current one-time price of $35 USD, a 90-day bottle works out to approximately $0.39 per day.
Alurevia’s Subscribe & Save option is $31.50 every three months, which is 10% off the $35 one-time price. Across a 90-day bottle, that is approximately $0.35 per day.
| Purchase option | Price per bottle | Supply | Approx. cost per day |
|---|---|---|---|
| One-time purchase | $35.00 | 90 days | $0.39 |
| Subscribe & Save 10% | $31.50 every 3 months | 90 days | $0.35 |
Why does the subscription deliver every three months?
The delivery interval is designed to match the bottle length. One bottle contains 90 capsules, and the labelled use is one capsule per day, so a delivery every three months approximately replaces the bottle as it is due to run out.
That means the subscription is not a monthly bottle delivery. It is one 90-capsule bottle every three months, for a total of four scheduled deliveries across a full year if the subscription continues unchanged.
Each subscription delivery costs $31.50 at the current 10% discount, saving $3.50 compared with the $35 one-time price. Customers can pause, skip or cancel according to the subscription controls shown on the store.
90-DAY SUPPLY — SUBSCRIBE & SAVE 10%
Make your 90-day routine automatic — and save.
One bottle contains 90 capsules at one capsule per day, so the subscription is designed around a full 90-day supply.
- $35.00 one-time purchase
- $31.50 every 3 months with Subscribe & Save
- Save $3.50 on every 90-day delivery
- Only 4 scheduled deliveries per year — not monthly
- No need to remember to reorder
- Pause, skip or cancel anytime
Why serving size matters when comparing magnesium supplements
Two products can both contain 90 capsules and offer very different amounts of supply. If one product directs three capsules per day, the bottle lasts 30 days. If another directs one capsule per day, it lasts 90 days.
For a useful comparison, check all four of these together:
- capsules per bottle;
- capsules per labelled serving;
- elemental magnesium per serving; and
- price per day or price per labelled serving.
That provides a much clearer picture than comparing bottle size or front-label milligrams in isolation.
A safety point worth knowing
The Food and Nutrition Board sets a tolerable upper intake level of 350mg per day for magnesium from supplements for adults. This does not include magnesium naturally present in food.
Alurevia Magnesium Complex provides 500mg elemental magnesium per capsule, which is above that supplemental upper limit. Follow the product directions and speak with a healthcare professional before use, particularly if you have kidney disease, take prescription medicines, are pregnant or nursing, or use other supplements containing magnesium.
Frequently asked questions
Is 90 capsules always a three-month supply?
No. It is a three-month supply only when the labelled use is one capsule per day. Always check the serving directions.
How many Alurevia bottles are in the subscription?
One bottle per delivery. Each bottle contains 90 capsules and is delivered every three months under the current subscription plan.
How many Alurevia subscription deliveries are there in a year?
Four scheduled deliveries per year if the subscription continues on its standard every-three-month schedule.
How much does the subscription save?
The current subscription price is $31.50 per delivery versus $35 one-time, a saving of $3.50 on each 90-day order.
This article is for general educational purposes and is not medical advice. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. Follow the product label and seek professional advice when appropriate.