Talk to your prescriber first if you have a history of kidney stones, kidney disease, hemochromatosis (iron overload), or are taking an iron supplement. High-dose vitamin C interacts with these conditions and the conversation has to happen.
Mega-dose vitamin C is an old harm-reduction tool for opioid withdrawal. Research going back to the 1960s suggests it can reduce withdrawal severity. It pairs with Suboxone, SR-17, tapering with leaf, cold turkey with helper meds, or any other path off the synthetics. It does not replace sleep, hydration, nutrition, or the rest of the supplement stack.
The protocol
This page assumes you’re using liposomal vitamin C from a reputable vendor (see Reputable brands below). The doses below are calibrated for liposomal absorption. Plain ascorbic acid hits a bowel-tolerance ceiling around 1 to 2 grams per dose where the rest causes diarrhea instead of benefit.
Preload if you can. Tissue saturation takes time. Starting at full dose the day withdrawal hits is playing catch-up.
| Situation | Start when |
|---|---|
| Planned quit date | 3 days before |
| Tapering off the synthetics | 1 to 2 weeks before, alongside the taper |
| Already in withdrawal | Skip preload, start at full dose now |
Preload dosing (ramp up):
- Days 1 to 2: 2 grams of liposomal C per day
- Days 3 to 4: 4 to 6 grams per day
- From your quit day (or once you reach your target taper level): full protocol below
During acute withdrawal:
- 1 to 2 grams of liposomal C every 2 to 3 waking hours
- Total: 6 to 12 grams per day
- No need to set overnight alarms; resume on waking
- Severe stretches may take more (some readers run 15 to 30 grams per day; cost climbs fast)
Tapering off vitamin C: once acute symptoms ease (typically days 5 to 7), step down to 1 to 3 grams per day. Hold at that maintenance level for a few weeks into post-acute.
Reputable brands
Liposomal-vitamin-C marketing is full of products that aren’t actually liposomal. The three brands the community has converged on, each with verifiable phospholipid encapsulation:
- LivOn Labs Lypo-Spheric Vitamin C (Amazon). The original commercial liposomal C. 1,000 mg packets.
- Quicksilver Scientific Liquid Liposomal Vitamin C (Amazon). Liquid format. Per-dose cost runs lower at higher daily totals.
- Aurora Nutrascience Mega-Liposomal Vitamin C (Amazon-canonical; also on iHerb and Vitacost). 3,000 mg packets, useful at higher daily totals.
We have no affiliate relationship with any of these vendors. Substitute brands you trust or buy elsewhere; the protocol is what matters.
Pair it with
- Vitamin E. The 2000 Evangelou study used C + E together as antioxidants (~5 mg E per kg body weight per day).
- Magnesium glycinate. For restless legs, sleep, and anxiety. See Helper Medications.
- Electrolytes. Megadosing increases urination; replace what you lose.
- The rest of the supplement stack. L-tyrosine, NAC, B-complex, omega-3. See Vitamins & Supplements.
Don’t do this if
- You have a history of kidney stones or kidney disease. High-dose vitamin C raises oxalate excretion, which is a stone-formation risk factor. Buffered forms (sodium ascorbate) are gentler if you proceed, but the prescriber conversation has to happen first.
- You have hemochromatosis or take an iron supplement. Vitamin C sharply increases iron absorption.
- You have G6PD deficiency. Rare, but high-dose vitamin C can trigger hemolysis in this group.
High-dose vitamin C can also interfere with glucose, occult-blood, and other lab tests. Tell your doctor if bloodwork is coming up.
If liposomal isn’t accessible
Buffered ascorbate powders (sodium ascorbate, calcium ascorbate) cost a fraction of liposomal per gram and raise the bowel-tolerance ceiling above plain ascorbic acid. Absorption is lower than liposomal, so daily totals trend higher to reach equivalent effect.
DIY liposomal (sodium ascorbate + lecithin + blender) is cheaper still, with less reliable absorption than commercial liposomal. Recipes are widely available online.
Research support
The original protocol comes from Alexander Schauss in 1969, at a Harlem heroin-withdrawal facility, using high-dose sodium ascorbate.
The most-cited follow-up is Evangelou et al., 2000: heroin-dependent inpatients received 300 mg/kg/day of vitamin C plus vitamin E. 10 to 16 percent of the treated group reported major withdrawal symptoms, versus 56.6 percent of the control group. Half the vitamin C group reported a 60-percent-or-greater reduction in symptoms.
A 2020 PMC review summarized the earlier work: “One-third of 60 patients reported that 70% or more of their acute withdrawal symptoms abated when taking buffered vitamin C during the active detox phase; half reported at least 60% relief of symptoms.”
These studies are old and small. The work hasn’t been replicated at modern scale, in part because vitamin C is unpatentable and there’s no commercial driver. The evidence is suggestive, not definitive. Many readers in this community find it helpful; some don’t.
Probable mechanisms
No single confirmed pathway. The plausible candidates:
- Adrenal support. Vitamin C is concentrated in adrenal tissue and depleted under stress.
- Antioxidant action. Withdrawal generates oxidative stress; vitamin C is the body’s main water-soluble antioxidant.
- Endorphin modulation. Some evidence that high-dose C inhibits endorphin-degrading enzymes, raising endogenous opioid tone.
- Histamine reduction. Vitamin C lowers histamine, which contributes to some of the discomfort of withdrawal.
The “vitamin C occupies opioid receptors” hypothesis from the 1960s doesn’t hold up under modern receptor pharmacology. Don’t expect this to “block” opioid use the way naltrexone does.
See Vitamins & Supplements for the broader supplement context, and NAD+ IV Therapy for the much pricier infusion-clinic adjunct readers sometimes ask about alongside vitamin C.