Super Achiever Club
Updated Jun 13, 2026 · by Felix Hesse · Verified by SAC team
Quicksilver Scientific Liposomal Glutathione Cacao Mint, 1.7 fl oz liquid — front of bottle
Best sublingual liquid
Quicksilver Scientific · Liquid nanoliposomal OPITAC glutathione (Kyowa), 100 mg · 1.7 fl oz

Quicksilver Scientific Liposomal Glutathione Review

7.8/10SAC Product Score™
! CONSIDER

The most aggressive delivery route — sublingual liquid nanoliposomal, at the highest cost-per-mg.

SAC Product Score™ — how it breaks down
  • Form & absorption strategy30%9.5
  • Dose vs studied range25%7.0
  • Testing & label transparency20%8.5
  • Value per day15%5.0
  • Real-world fit10%7.5
  • Buy ifYou specifically believe in sublingual delivery and want the most aggressive absorption route
  • Buy ifYou want a named branded source (OPITAC, Kyowa) in a premium specialist liquid format
  • Skip ifYou want the liposomal advantage without the premium — softgel liposomals (#2, #3) are far cheaper per mg
  • Skip ifYou avoid alcohol — it contains ethanol — or dislike a hold-then-swallow liquid ritual
Read the full analysis

Quicksilver Scientific Liposomal Glutathione is the connoisseur's absorption play: a liquid nanoliposomal you hold under the tongue, so some of the dose can absorb across the oral mucosa before the gut ever sees it. It's the most aggressive theoretical answer on our list to glutathione's central problem — that plain oral GSH may not absorb (Witschi 1992) — and it uses OPITAC, Kyowa's oral-grade branded glutathione (a sibling to Setria, but not Setria itself), in a sunflower-phosphatidylcholine matrix.

The reasons it lands at #7 rather than higher are all about cost and practicality, not credibility. It's the most expensive pick per milligram by a wide margin, the bottle is small, it carries ethanol, and it asks for a hold-then-swallow ritual that isn't for everyone. And 'most aggressive in theory' isn't 'proven best in practice' — there's no head-to-head trial showing it beats a softgel liposomal. It's a premium, conviction 'consider.' Here's the full breakdown.

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▸ THE SCORE

How we built the SAC Product Score™ — 7.8/10

Form & absorption strategy30%9.5/10

A liquid nanoliposomal designed for SUBLINGUAL absorption — the most aggressive theoretical answer to glutathione's absorption problem, aiming to bypass much of digestion entirely (the objection raised by Witschi 1992). Uses the named OPITAC (Kyowa) source. Top-tier on delivery ambition, with the honest caveat that 'most aggressive' is theoretical — liposomal as a category, not this route specifically, has the human trial (Sinha 2018).

Dose vs studied range25%7/10

100 mg per serving — a low elemental dose, scored generously because sublingual nanoliposomal delivery is the point, but there's no established sublingual dose-response to validate it. The flexible pump lets you take more, but you'll burn through the small bottle quickly doing so. Honest mid-score: form offsets the low milligrams only so far.

Testing & label transparency20%8.5/10

Named OPITAC (Kyowa) glutathione with sunflower-derived phosphatidylcholine, gluten- and dairy-free, from a well-regarded premium liposomal specialist — strong provenance and a clearly-disclosed formulation. Held just short of the top by the absence of a third-party NSF/USP seal and the ethanol content, which is worth flagging plainly.

Value per day15%5/10

At roughly $1.80 per 100 mg serving in a small 1.7 fl oz bottle, it's the highest cost-per-milligram on the list by a wide margin. You're paying for the nanoliposomal technology and the specialist brand, not the dose. Clearly the weakest axis — this is a premium purchase, not a value one.

Real-world fit10%7.5/10

Flexible pump dosing is a real plus for fine-tuning, but the format asks for a sublingual hold-then-swallow ritual, the cacao-mint taste won't suit everyone, and it contains ethanol. More friction than a swallow-and-go capsule, offset partly by the dosing flexibility. A format you have to be willing to live with daily.

▸ SPECS

The product at a glance

Active form
Liquid nanoliposomal OPITAC glutathione (Kyowa) — sublingual
Source
OPITAC branded (Kyowa's oral grade) — NOT Setria; sunflower phosphatidylcholine
Per serving
100 mg glutathione (2 pumps), held sublingually then swallowed
Size
1.7 fl oz (50 mL)
Delivery ambition
Sublingual route aims to bypass much of digestion (cf. Witschi 1992)
Contains
Ethanol; gluten- and dairy-free
Format note
Flexible pump dosing; hold-then-swallow ritual; cacao-mint flavor
Price
$45 / 50 mL ≈ $1.80 per 100 mg serving (highest cost-per-mg on the list)
▸ TRUTH CHECK

Marketing claims vs. reality

Partial

“Sublingual liposomal delivery bypasses digestion for superior absorption.”

Directionally reasonable — sublingual nanoliposomal delivery is the most aggressive strategy to circumvent the gut breakdown that limits plain oral GSH (Witschi 1992), and liposomal delivery as a category has human support (Sinha 2018). 'Partial' because there's no head-to-head trial proving THIS route beats softgel liposomals or quantifying 'superior'; it's a strong theoretical claim, not a proven comparative result.

Verified

“Uses OPITAC branded glutathione from Kyowa.”

The product uses OPITAC, Kyowa's oral-grade branded glutathione, with sunflower phosphatidylcholine — a named, reputable source. Verified, with the honest clarification that OPITAC is a different Kyowa grade from Setria, not Setria itself.

Verified

“100 mg glutathione per serving.”

The 100 mg per 2-pump serving is as stated. A low elemental dose, scored in context of the sublingual delivery format and the flexible pump dosing that lets users adjust.

Not verified

“Advanced nanoparticle technology for maximum bioavailability.”

'Maximum bioavailability' is an unverifiable superlative. The nanoliposomal sublingual technology is genuinely sophisticated and the most aggressive delivery approach here, but there's no published head-to-head data establishing it as 'maximum' versus other liposomal forms — treat it as premium engineering, not a proven absorption ranking.

Verified

“Gluten- and dairy-free.”

The formulation is gluten- and dairy-free as stated. Worth pairing with the honest flag that it does contain ethanol, which matters for alcohol-avoidant buyers.

▸ THE DEEP DIVE

What our test actually found

01The sublingual route is its real differentiator — and it's a genuine one

What sets Quicksilver apart from every other pick is the delivery route: a liquid nanoliposomal held under the tongue, designed so some of the dose absorbs across the oral mucosa before digestion. That's the most aggressive theoretical answer to glutathione's absorption problem — more ambitious than a softgel liposomal, which still goes through the gut. For a buyer who specifically believes sublingual delivery is worth pursuing, this is the product built around that conviction, from a respected specialist brand using the named OPITAC source.

02OPITAC, not Setria — a distinction we flag deliberately

It uses OPITAC, Kyowa's oral-grade glutathione, not the Setria grade that the #1, #2, and #3 picks carry. Both come from the same reputable Japanese manufacturer, but they're different branded grades, and glutathione marketing frequently blurs such distinctions. We call it out because provenance precision is part of honest sourcing: OPITAC is a legitimate named source, and you should know that's what you're buying — not assume it's interchangeable with Setria.

03Cost-per-milligram is the deal-decider against it

At about $1.80 per 100 mg serving in a small 50 mL bottle, this is the most expensive glutathione per milligram on the list by a wide margin — and if you use the flexible pump to take more, the small bottle empties fast. You're paying for the nanoliposomal technology and the specialist brand, not for dose. That's defensible for a conviction buyer who values the sublingual route, but for anyone weighing dollars against glutathione delivered, the softgel liposomals (#2, #3) offer the liposomal idea far cheaper, and a plain capsule cheaper still.

04Be honest with yourself about the format before buying

The ethanol and the hold-then-swallow ritual are not minor footnotes. If you avoid alcohol, the ethanol rules it out. If you dislike holding a flavored liquid in your mouth or won't keep up the sublingual routine, the theoretical absorption advantage is moot — because the supplement only works if you actually take it consistently over months. The flexible pump dosing is a real plus for fine-tuning, but weigh the daily friction honestly against a swallow-and-go capsule before paying the premium.

▸ THE TRADE-OFFS

Pros & cons, no sugar-coating

Pros
  • Liquid nanoliposomal SUBLINGUAL delivery — the most aggressive theoretical absorption route on the list
  • Named OPITAC (Kyowa) source with sunflower phosphatidylcholine; gluten- and dairy-free
  • Flexible pump dosing lets you fine-tune your dose; respected premium liposomal specialist
  • Targets the core objection that plain oral GSH may not absorb (Witschi 1992)
Cons
  • Highest cost-per-milligram on the list by a wide margin; small 1.7 fl oz bottle
  • Contains ethanol; sublingual hold-then-swallow ritual and taste aren't for everyone
  • Uses OPITAC, NOT Setria; 'maximum bioavailability' unproven; no head-to-head beating softgel liposomals
▸ THE BOTTOM LINE

The most aggressive delivery route — a premium 'consider' for sublingual believers.

Quicksilver Scientific Liposomal Glutathione is the pick for the buyer with a specific conviction: that sublingual delivery is worth pursuing. It's the most aggressive theoretical answer on the list to glutathione's absorption problem — a liquid nanoliposomal held under the tongue to bypass much of digestion — built by a respected specialist brand around the named OPITAC (Kyowa) source. If that's the route you want, nothing else here matches its delivery ambition. It lands at #7 as a 'consider,' not a 'buy,' because of cost and practicality. It's the most expensive pick per milligram by a wide margin, in a small bottle, with ethanol and a hold-then-swallow ritual that won't suit everyone — and crucially, 'most aggressive in theory' isn't 'proven best': there's no head-to-head trial showing it beats a softgel liposomal, and liposomal as a category (not this route specifically) is what carries the human evidence. So if you want the liposomal advantage without the premium, the softgels (#2, #3) are the rational choice; if you want maximum glutathione status per dollar, a plain capsule (#1) or NAC wins easily. Buy Quicksilver only if the sublingual route is what you specifically want and the price doesn't deter you.

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▸ ALTERNATIVES

If this doesn’t fit — try these

Pure Encapsulations Liposomal Glutathione

8.6/10

The liposomal idea in a far more cost-effective, convenient softgel — Setria in a phospholipid complex, one a day, with human evidence behind the form (Sinha 2018). The rational liposomal pick if you don't specifically need sublingual.

See it on the list →

Core Med Science Liposomal Glutathione

8.4/10

Liposomal delivery at a full 500 mg per serving and the best liposomal value — five times the elemental dose of Quicksilver, for less money.

See it on the list →

Healthy Origins Setria L-Glutathione

8.7/10

The opposite end of the spectrum — a full 500 mg of named Setria at the lowest cost-per-day. Buy this if you want maximum glutathione per dollar and don't need an exotic delivery route.

See it on the list →
▸ RESEARCH

Sources & further reading

  1. Sinha 2018Sinha R, Sinha I, Calcagnotto A, Trushin N, Haley JS, Schell TD, Richie JP Jr · 2018 · European Journal of Clinical Nutrition · PMID 28853742

    Oral supplementation with liposomal glutathione elevates body stores of glutathione and markers of immune function

    Oral liposomal glutathione raised body stores and immune markers in humans — the category evidence behind liposomal delivery. Cited honestly: it supports liposomal as a form, not Quicksilver's sublingual route specifically.

  2. Witschi 1992Witschi A, Reddy S, Stofer B, Lauterburg BH · 1992 · European Journal of Clinical Pharmacology · PMID 1362956

    The systemic availability of oral glutathione

    A single 3 g oral dose of plain glutathione produced no plasma rise — 'negligible' availability. The gut-absorption problem that Quicksilver's sublingual nanoliposomal route is designed to circumvent.

  3. Richie 2015Richie JP Jr, Nichenametla S, Neidig W, Calcagnotto A, Haley JS, Schell TD, Muscat JE · 2015 · European Journal of Nutrition · PMID 24791752

    Randomized controlled trial of oral glutathione supplementation on body stores of glutathione

    250-1000 mg/day plain oral glutathione raised body stores over 6 months — context for how much more elemental glutathione a plain capsule supplies than this 100 mg sublingual serving.