Comparing a one-capsule vitamin C serving with a deliberately sustained-release tablet.
Ester-C 1000 mg with Citrus Bioflavonoids Capsules, 105 capsules
View on AmazonCompared with NOW Vitamin C-1000 Sustained Release Tablets.
A release description refers to a specific product
Ester-C research reported concentrations of vitamin C in certain cells at particular sampling times. That is a different question from whether a tablet has been designed to release its ingredients gradually. Someone who wants the NOW sustained-release format should look for those words on the pack rather than assuming all products with 1,000 mg behave identically.
| What changes | Ester-C 1000 mg with Citrus Bioflavonoids Capsules, 105 capsules | NOW Vitamin C-1000 Sustained Release Tablets |
|---|---|---|
| Unit | One citrus-bioflavonoid capsule | Sustained-release tablet |
| Distinguishing label detail | 108 mg calcium per labeled serving | Sustained Release in the exact product name |
The focal Ester-C product lists 1,000 mg vitamin C and 108 mg calcium per capsule. NOW describes its C-1000 as a sustained-release tablet.
Consider the whole unit before ordering
A capsule may be the preferred format for someone who dislikes compressed tablets, but one capsule can still be large. Check whether the packaging or manufacturer gives actual dimensions. Do not crush a sustained-release tablet or alter a capsule on the assumption that both retain their intended properties. Ask a pharmacist about a suitable form if swallowing is difficult.
Customer feedback on related products
Accounts from other listings in this brand’s range identify the specific product above the comment.
- Ester-C 500 mg 24 Hour Tablets
A longtime customer found the 500 mg tablets smaller and easier to swallow than the 1,000 mg version.
Original Amazon review ↗ - Ester-C 500 mg 24 Hour Tablets
One reviewer liked the lack of a bitter aftertaste.
Original Amazon review ↗ - Ester-C 500 mg 24 Hour Tablets
A buyer who expected two packs reported receiving one.
Original Amazon review ↗
Our recommendation
NOW is the straightforward choice for someone specifically seeking that manufacturer’s sustained-release tablet. Ester-C offers its own one-capsule formula with declared calcium and citrus ingredients.