⚠️ Community information, not medical advice. Talk to your prescriber before starting any high-dose supplement protocol, especially if you have kidney issues, take medications, or have a history of kidney stones. Not appropriate for everyone.
Vitamin C megadosing is one of the older harm-reduction tools in the opioid withdrawal toolkit. It has research support going back to the 1960s, and the studies that exist suggest it can meaningfully reduce withdrawal severity. It is not a magic bullet. It works as part of a broader approach (rest, hydration, nutrition, sleep, other supplements). For some people it makes withdrawal noticeably more manageable; for others the effect is subtle or hard to distinguish from other interventions.
This post is for people who want to use vitamin C as part of their withdrawal protocol and want to know how to do it well. The short version: high doses (3-15+ grams per day), divided across the day, started before your last dose if possible, and using liposomal form for higher absorption and less GI upset.
What the research actually says
The original work was done by Alexander Schauss in 1969, who developed a protocol of high-dose sodium ascorbate (buffered vitamin C) for heroin withdrawal at a Harlem treatment facility. The mechanism was hypothesized to involve vitamin C occupying opioid receptors and modulating endorphin breakdown.
A 2000 study (Evangelou et al.) gave heroin-dependent inpatients ascorbic acid at 300 mg/kg/day plus vitamin E. Results: only 10-16% of vitamin C-treated subjects experienced major withdrawal symptoms, vs. 56.6% of the control group. That’s a meaningful difference. Half of the vitamin C group reported at least 60% reduction in withdrawal symptoms.
A 2020 review in PMC summarized: “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.”
The honest caveats: these studies are old, sample sizes are small, and the research hasn’t been replicated at the scale that would make this a mainstream clinical recommendation. Newer studies haven’t been done because there’s no profit motive — vitamin C is cheap and unpatentable. The evidence is suggestive, not definitive. Many people in this community have found it helpful; some haven’t.
How it (probably) works
Several proposed mechanisms, no single confirmed one:
- Adrenal support. Withdrawal puts massive stress on the adrenals; vitamin C is concentrated in adrenal tissue and depleted under stress.
- Antioxidant action. Withdrawal generates significant oxidative stress; vitamin C is your body’s primary water-soluble antioxidant.
- Endorphin modulation. Some evidence suggests high-dose vitamin C may inhibit endorphin-degrading enzymes, raising endogenous opioid levels.
- Histamine reduction. Vitamin C reduces histamine, which is implicated in some of the discomfort of opioid withdrawal.
- General immune and recovery support. You’re under physiological stress; the body uses vitamin C aggressively.
The “occupies opioid receptors” hypothesis from the 1960s isn’t well-supported by modern receptor pharmacology, so don’t expect it to “block” your opioid use the way naloxone does.
Why liposomal specifically
Regular ascorbic acid (the cheap white powder or tablet form) hits a hard ceiling for absorption. Above about 1-2 grams per dose, most of the rest doesn’t get absorbed and instead ends up causing diarrhea (called “bowel tolerance” — you’ll know when you hit it). That’s a real problem for high-dose protocols, because the doses that show benefit in withdrawal research are well above bowel tolerance for most people.
Liposomal vitamin C encapsulates the ascorbic acid in phospholipid spheres that get absorbed differently — more like a fat than a water-soluble vitamin. Result:
- Much higher peak blood levels (research suggests 2-3x higher than equivalent oral ascorbic acid doses)
- No bowel tolerance issues at doses that would otherwise cause diarrhea
- More usable vitamin C reaching your tissues including potentially the brain
The tradeoff: it’s significantly more expensive than regular vitamin C powder. Quality matters — many products marketed as “liposomal” aren’t truly liposomal. Look for brands that show actual particle-size data or reputable third-party testing. Reliable brands: Quicksilver, LivOn (Lypo-Spheric), Aurora Nutrascience, Pure Encapsulations.
Cheaper alternatives if liposomal isn’t accessible:
- Sodium ascorbate (buffered C) — easier on the stomach than ascorbic acid, allows higher doses before bowel tolerance hits
- Calcium ascorbate — also buffered, similar effect
- Liposomal C powder — cheaper than premade liposomal, you mix it yourself
Dosing protocols
There’s no single “correct” protocol. Here’s the range used in the literature and community:
The Schauss baseline (most cited):
- 2 grams sodium ascorbate every 2 waking hours
- Roughly 12-16 grams/day at full dose
- Reduce gradually as withdrawal symptoms ease
Liposomal-adjusted (community common):
- 1-2 grams liposomal C every 2-3 waking hours during peak withdrawal
- Total: 6-12 grams/day depending on response
- Lower total dose because absorption is higher
Higher-dose protocol (for severe withdrawal):
- 3-5 grams every 2 hours of liposomal during the worst stretch
- Total: 15-30 grams/day
- Used by some users, but more expensive and not necessarily more effective
Listen to your body. If symptoms aren’t improving, you can take more. If you’re getting any GI distress, drop the dose or switch to liposomal. There’s no benefit to “pushing through” GI symptoms; that’s just unabsorbed vitamin C.
Preloading: when to start
This is the part most people get wrong. Vitamin C megadosing works best when you start before withdrawal hits, not after.
The community-recommended approach:
- Start dosing 3 days before your planned quit date if you’re doing a quit
- Start dosing 1-2 weeks before if you’re doing a taper, alongside your taper
- Build up gradually: 2 grams/day for a few days, then 4-6 grams/day, then full protocol when you stop or reach your target taper level
The reasoning: vitamin C tissue saturation takes time. Starting at full dose the day withdrawal hits means you’re playing catch-up while your symptoms are at their worst.
During acute withdrawal: maintain full dose, dose every 2-3 hours including overnight if you’re awake (dose-on-waking is fine, no need to set alarms).
Tapering off: once acute symptoms ease (typically days 5-7), gradually reduce dose. Most people drop to a maintenance level (1-3 grams/day) for several weeks afterward to support recovery and PAWS.
What to combine it with (and what not to)
Synergistic combinations:
- Vitamin E — the original Evangelou study used vitamin C with vitamin E (5 mg/kg/day). The two work together as antioxidants.
- Magnesium glycinate — for sleep, anxiety, and muscle symptoms.
- Electrolytes — vitamin C megadosing increases urination; replenish.
- Standard withdrawal stack — L-tyrosine, NAC, B-complex, omega-3, etc. (see #vitamins-supplements)
- Hydration — drink more water than you think you need.
Be careful with:
- Iron supplements. Vitamin C dramatically increases iron absorption. If you have hemochromatosis or take iron supplements, talk to your doctor first.
- Kidney issues. High-dose vitamin C can increase oxalate excretion, which is a kidney stone risk factor for some people. If you have a history of kidney stones or kidney disease, talk to your prescriber.
- G6PD deficiency. A genetic condition where high-dose vitamin C can trigger hemolysis. Rare but worth knowing about.
- Certain blood tests. High-dose vitamin C can interfere with glucose, occult blood, and other lab tests. Tell your doctor if you’re getting bloodwork.
Common mistakes
- Starting too late. Beginning megadosing the day withdrawal hits is suboptimal. Preload.
- Dosing too infrequently. Vitamin C has a short half-life (about 30 minutes for plasma). Once or twice a day doesn’t maintain blood levels. Every 2-3 hours during waking hours is the protocol for a reason.
- Underdosing. “I took 2 grams a day and it didn’t help” — that’s not the protocol. The therapeutic doses are 6-15+ grams/day.
- Using cheap “liposomal” products. Many aren’t actually liposomal. Quicksilver and LivOn are reliable.
- Stopping too soon. Don’t stop the day acute withdrawal ends. Taper down over a week or more.
- Treating it as a standalone solution. It’s an adjunct, not a replacement for sleep, hydration, and other recovery work.
Cost reality
This is not a cheap protocol if you use liposomal exclusively. Premade liposomal C runs roughly $40-80 for a bottle that gives you 5-10 days at therapeutic doses. For a full preload + acute + taper-down protocol, expect to spend $150-400 on liposomal C alone.
Cheaper approaches:
- Sodium ascorbate powder — about $20-30/lb, lasts months even at megadose levels
- Mix your own liposomal with sodium ascorbate, lecithin, and a blender — DIY recipes are widely available, much cheaper, somewhat less reliable absorption than commercial liposomal
- Combine — sodium ascorbate for bulk dosing, liposomal for the 1-2 highest-priority doses per day
When this isn’t the right tool
- You have kidney problems or a history of kidney stones. Talk to your doctor first.
- You’re already pursuing a Suboxone induction or other MAT path. Vitamin C megadosing is for people doing more direct taper or cold-turkey approaches. It complements MAT but isn’t the primary tool there.
- You can’t afford the protocol and won’t dose at therapeutic levels. Underdosing doesn’t help much. Better to focus on cheaper interventions that you can do consistently.
- You’re on long-acting synthetics like MGM-15 or pseudo at high doses. These need more pharmaceutical support; vitamin C alone isn’t enough.
Bottom line
Vitamin C megadosing is an inexpensive (relatively), low-risk, evidence-supported tool that has helped many people through opioid withdrawal. Liposomal form makes higher therapeutic doses practical without GI side effects. Preload, dose frequently, combine with the rest of a real recovery protocol, and don’t expect miracles. For the right person it can take a meaningful edge off withdrawal. For everyone, it’s adjunctive support, not the main event.
See #vitamins-supplements for the broader supplement context, #what-is-paws for the longer-term picture.