Pure Encapsulations Buffered Ascorbic Acid, 90 Capsules Review
#5 of 9 · Best for Sensitive Stomachs✓ Label verified · Supplement Facts read Sep 7, 2026Real retailer photo, cut out. Label unedited.
Consider it. The gentlest, cleanest capsule here — a considered choice for reactive users. Three mineral ascorbates make this the most pH-neutral option in the set, and the hypoallergenic, filler-free formula is built for people who react to everything.
~$34~$0.38 / capsule
Why It Scores 6.6 — And The Label Line Behind Each Number
Form & Bioavailability
30% of scoreFully buffered with calcium, magnesium and potassium ascorbates. Absorption matches ordinary ascorbic acid — the mineral buffering changes tolerance, not uptake — but it's a clean, well-formulated version of the form.
- Form
- Calcium, magnesium & potassium ascorbates (fully buffered)
Third-Party Testing & QA
25% of scoreReputable practitioner-grade brand with brand-stated third-party testing and tight formulation standards. Strong, though not carrying a public USP/NSF product seal.
- Testing
- Brand-stated third-party tested
Dose Strategy vs. Clinical Range
15% of score1,000 mg per capsule per the brand label — a single bolus that overshoots the saturation ceiling. Dose isn't surfaced in the listing meta, so confirm on the current label.
- Dose
- 1,000 mg per capsule (per brand label)
GI Tolerance & Suitability
15% of scoreThree mineral ascorbates make this the gentlest, most pH-neutral option in the group, and the hypoallergenic, filler- and binder-free build is purpose-made for reactive individuals.
Value per Serving
15% of scoreAt about $0.38 per capsule it's the most expensive capsule here. You pay for purity and tolerability, not absorption.
- Count
- 90 capsules / 90 servings
- Price
- ~$34
- Cost per serving
- ~$0.38 / capsule
- More Specs
- Formulation
- Hypoallergenic, no fillers or binders
Label verified. Every figure read from the Supplement Facts photo, Sep 7, 2026.
Marketing Claims Vs. Reality
Three mineral ascorbates make it the gentlest, most pH-neutral vitamin C.
Calcium, magnesium and potassium ascorbates neutralize the acidity of ascorbic acid, which is the most reliable route to GI comfort and consistent with full-buffering formulation.
The mineral buffering improves bioavailability.
Mineral ascorbates absorb equivalently to plain ascorbic acid; you gain tolerance, not uptake. Saturable kinetics (Levine 1996) apply regardless of buffering.
Hypoallergenic with no fillers or binders.
Consistent with Pure Encapsulations' published hypoallergenic formulation standards.
1,000 mg vitamin C per capsule.
The dose is stated on the brand label but is not surfaced in the listing meta; confirm on the current label as formulations can change.
What Our Test Actually Found
Built for people who react to everything
The combination of full mineral buffering plus a hypoallergenic, filler-free base is the point. If cheaper buffered tablets still bother you, this is the next step up in gentleness.
You're buying tolerability, not absorption
Be clear-eyed: the mineral ascorbates neutralize acidity, they don't get more vitamin C into your blood. Absorption tracks any ascorbic acid, so don't pay this premium expecting better uptake.
Practitioner-grade, at a practitioner price
Third-party testing and tight standards back the brand, but at ~$0.38 a capsule it's the costliest capsule here. That's a considered choice for sensitive users, not a value play.
Confirm the label dose
The 1,000 mg figure comes from the brand label and isn't in the listing meta. Double-check the current bottle, since practitioner brands occasionally adjust formulations.
Full analysis: all pros & cons (7), buy if / skip if
- Three mineral ascorbates make this the gentlest, most pH-neutral option in the set
- Hypoallergenic with no fillers or binders — built for reactive individuals
- Reputable practitioner-grade brand with third-party testing
- Widely stocked through clinicians, with consistent formulation standards
- Most expensive per gram of all the capsules here
- The mineral buffering aids tolerance, not bioavailability — you pay for purity, not absorption
- Dose isn't surfaced in the listing meta; confirm on the label
- Plain or partially-buffered vitamin C still upsets your stomach
- You want a hypoallergenic formula with no fillers or binders
- You value practitioner-grade purity over cost
- You tolerate cheaper buffered C like NOW just fine
- You're optimizing for value per serving
Three mineral ascorbates make this the most pH-neutral option in the set, and the hypoallergenic, filler-free formula is built for people who react to everything. It's a practitioner-grade brand with third-party testing. The trade-offs: it's the priciest capsule per gram, and the buffering aids tolerance, not bioavailability.
If ordinary vitamin C reliably upsets your gut, this is the most comfortable capsule on the list. Pure Encapsulations buffers ascorbic acid with three mineral ascorbates — calcium, magnesium and potassium — for a near-neutral pH, and builds it hypoallergenic with no fillers or binders. Be clear about what you're buying, though: comfort and purity, not extra absorption.
The most comfortable capsule for reactive users
If plain vitamin C reliably upsets your gut and you value a clean, hypoallergenic formula, this is the most comfortable capsule on the list. Just be clear about what you're buying — formulation and tolerability, not extra absorption. At ~$0.38 a serving it's a considered choice for sensitive users, not a value play.
If This Doesn’t Fit — Try These
03NOW C-1000 Complex
Our take: the best everyday all-rounder — gentler than plain C, cheaper than the boutique buffered options, from a brand that actually passes independent GMP audits.
06American Health Ester-C
Our take: a legitimately gentle option, but you're paying a brand premium for a claim the independent evidence doesn't back.
01Thorne Vitamin C + Flavonoids
Our take: this wins on the two things that actually move the needle — independent testing and a dose you can use intelligently — rather than on a marketing form.
Quick Answers
Why is this gentler than other vitamin C?
It's fully buffered with three mineral ascorbates, which neutralize the acidity of ascorbic acid for a near-neutral pH. That's the most reliable way to avoid stomach upset.
Does the mineral buffering help me absorb more?
No. Buffering improves tolerance, not uptake — your body absorbs it the same as plain ascorbic acid. You're paying for comfort and a clean, hypoallergenic formula.
Is it worth the higher price over NOW's buffered tablet?
Only if cheaper buffered options still bother you or you specifically need a hypoallergenic, filler-free formula. Otherwise NOW delivers most of the comfort for far less.
Sources & Further Reading
2 peer-reviewed sources, each linked to PubMed
- [1] Levine M, et al. Vitamin C pharmacokinetics in healthy volunteers: evidence for a recommended dietary allowance. Proc Natl Acad Sci USA. 1996;93(8):3704-3709. PMID 8623000 — Vitamin C pharmacokinetics in healthy volunteers: evidence for a recommended dietary allowance. Mineral-buffered and plain ascorbic acid share the same saturable absorption; buffering does not raise plasma vitamin C.
- [2] Padayatty SJ, et al. Vitamin C pharmacokinetics: implications for oral and intravenous use. Ann Intern Med. 2004;140(7):533-537. PMID 15068981 — Vitamin C pharmacokinetics: implications for oral and intravenous use. Oral vitamin C plasma levels are tightly regulated regardless of the salt form, so a 1,000 mg buffered dose still overshoots retention.
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