503A compounded
NAD+ Injection
Cellular energy, cognitive function, and systemic antiaging support.
Moderate evidence
IV / injection nutrient · ascorbic acid
Vitamin C injection, antioxidant and immune support under physician supervision.
Vitamin C (ascorbic acid) is an essential, water-soluble nutrient the body cannot make on its own. Injection bypasses the absorption ceiling of the gut and produces plasma levels that oral dosing cannot reach. Injectable ascorbic acid is FDA-approved for vitamin C deficiency. Higher-dose antioxidant, immune, and skin-radiance protocols are off-label, and we frame the evidence honestly: strong for correcting deficiency, supportive but limited for general wellness.
What it is
Vitamin C is L-ascorbic acid, an essential micronutrient and one of the body's primary water-soluble antioxidants. Humans lack the enzyme to synthesize it, so it must come from diet or supplementation. It is required for the synthesis of collagen, carnitine, and several neurotransmitters, and it supports normal immune function.
There is an FDA-approved injectable ascorbic acid drug indicated for the treatment of vitamin C deficiency (scurvy) when oral administration is not possible or not adequate. Higher-dose antioxidant and immune-support protocols sit outside that approved indication and are considered off-label. Preservative-free, buffered preparations used at higher doses are typically 503A pharmacy compounded.
We do not market vitamin C injection as a treatment or cure for cancer, infection, or chronic disease. High-dose intravenous vitamin C has been studied in those settings, but the clinical trial evidence is mixed and it is not standard of care. We offer it as an adjunctive wellness and deficiency-correction therapy only.
How it works
Antioxidant function. Ascorbate donates electrons to neutralize reactive oxygen species and regenerates other antioxidants, including vitamin E, helping to limit oxidative stress.
Collagen cofactor. Vitamin C is a required cofactor for prolyl and lysyl hydroxylase, enzymes that stabilize collagen. This is the mechanistic basis for its role in skin, connective tissue, and wound healing, and why deficiency produces the collagen-failure signs of scurvy.
Immune support. Vitamin C accumulates in white blood cells and supports several aspects of immune cell function. Deficiency impairs immunity; correcting it restores function. Benefit beyond a replete state is less well established.
Injectable versus oral. Oral absorption is tightly regulated by intestinal transporters and plateaus, so plasma levels cannot rise indefinitely with higher oral doses. Injection bypasses that ceiling and produces substantially higher transient plasma concentrations, which is the pharmacologic rationale for the injectable route.
Why dosing is screened. At pharmacologic plasma levels, ascorbate can act as a pro-oxidant in some tissues and is metabolized in part to oxalate. These properties are the reason high-dose protocols require G6PD and renal screening, discussed below.
Conditions and use cases
Where vitamin C injection has a legitimate role.
- Correction of diagnosed vitamin C deficiency when oral intake is inadequate. This is the FDA-approved indication and the strongest evidence.
- Adjunctive antioxidant support and post-procedure recovery in an aesthetic context, paired with collagen-supporting protocols (off-label).
- Immune support during periods of higher demand, framed as adjunctive rather than a treatment for any specific infection (off-label).
- NOT positioned as: a cancer therapy, a treatment for active infection, or a substitute for vaccination, antibiotics, or primary medical care.
Expected timeline
What patients commonly observe.
Day 0
Screening first
G6PD status and renal/oxalate history reviewed before any higher-dose infusion. Deficiency correction is dosed conservatively.
Week 0 to 2
Tolerability
Subjective reports of energy and recovery. Objective antioxidant benefit is difficult to measure directly in a replete patient.
Week 2 to 6
Recovery and skin support
Used as an adjunct in aesthetic recovery and collagen-supporting protocols, often alongside other antioxidant therapies.
Month 2 to 3
Reassessment
Provider reassesses indication, cadence, and whether oral repletion is sufficient. No validated long-term schedule exists for general wellness use.
Investment and access
Care plans, not menus.
Genesis Longevity therapies are dispensed only after a complimentary consultation and Good Faith Exam. Schedule yours to receive a personalized plan tailored to your biology and goals.
Side effects
What patients commonly report.
Common. Injection site discomfort, mild flushing, lightheadedness, or transient nausea, usually related to infusion rate. Slowing the infusion typically resolves these.
Dose and screening dependent. High-dose intravenous vitamin C can precipitate hemolysis in people with G6PD deficiency and can contribute to calcium-oxalate kidney stones or, rarely, oxalate nephropathy, particularly with renal impairment or a history of oxalate stones.
Rare. Hypersensitivity reactions. As with any injectable, sterile technique and a regulated compounding source matter.
Contraindications
Who should not use this therapy.
Show contraindications
G6PD deficiency. A contraindication to high-dose intravenous vitamin C because of hemolysis risk. We screen before higher-dose protocols.
History of calcium-oxalate kidney stones or oxalate nephropathy. Caution or avoidance, given the oxalate metabolic pathway.
Significant renal impairment. Reduced clearance increases oxalate-related risk; high-dose protocols are generally avoided.
Hemochromatosis or iron-overload states. Vitamin C increases iron absorption and mobilization and should be used cautiously.
Pregnancy and breastfeeding. Routine high-dose use is not established; care is individualized with the provider.
Pairs well with
Therapies that complement this protocol.
- 503A compounded
Glutathione Injection
Antioxidant and detoxification support.
Moderate evidence - 503A compounded
B12 / MIC Injection
Energy metabolism, fat processing, and lipotropic support.
Moderate evidence
Frequently asked
Frequently asked questions about Vitamin C injection.
Injectable ascorbic acid is FDA-approved for the treatment of vitamin C deficiency (scurvy) when oral intake is not adequate. Using it at higher doses for general antioxidant, immune, or skin-radiance support is off-label. Preservative-free, higher-dose preparations are typically 503A pharmacy compounded.
For raising plasma levels, yes. Oral absorption plateaus because intestinal transport is saturable, so blood levels cannot rise indefinitely with larger oral doses. Injection bypasses that ceiling and produces much higher transient plasma concentrations. Whether those higher levels translate into added clinical benefit for a person who is already replete is less clear, and for routine maintenance oral vitamin C is often sufficient.
High-dose intravenous vitamin C can trigger red blood cell breakdown (hemolysis) in people with glucose-6-phosphate dehydrogenase (G6PD) deficiency, a common inherited enzyme condition. Screening before higher-dose protocols is a standard safety step.
Correcting a deficiency restores normal immune function, but evidence that high-dose vitamin C treats or prevents specific infections in well-nourished people is limited and mixed. We offer it as adjunctive support, not as a treatment for any infection and not as a substitute for vaccination, antibiotics, or medical care.
Deficiency correction uses conservative dosing per the approved labeling. Higher-dose wellness protocols vary and are individualized after screening, given as a slow IV infusion or IM injection. Cadence is set by your provider based on indication and response.
Sources
Citations & references
- [1]Padayatty SJ, et al. Vitamin C pharmacokinetics: implications for oral and intravenous use. Ann Intern Med. 2004. Source
- [2]Padayatty SJ, et al. Vitamin C: intravenous use by complementary and alternative medicine practitioners and adverse effects. PLoS One. 2010. Source
- [3]Hemila H, Chalker E. Vitamin C for preventing and treating the common cold. Cochrane Database Syst Rev. 2013. Source
- [4]FDA prescribing information for ascorbic acid injection (ASCOR), indicated for vitamin C deficiency. Source
Status & disclosures
- FDA status: approved for deficiency, off-label for wellness
- Injectable ascorbic acid is FDA-approved to treat vitamin C deficiency. Higher-dose antioxidant, immune, and skin-radiance protocols are off-label uses.
- 503A compounded for higher-dose preparations
- Preservative-free, buffered, higher-dose preparations are compounded by licensed 503A pharmacies under U.S. FDA regulations. Genesis sources from regulated compounders that follow USP standards.
- Screening required before high-dose use
- High-dose intravenous vitamin C requires G6PD screening and review of renal and oxalate-stone history before administration. It is not offered as a treatment for cancer, infection, or chronic disease.
Next step
Talk to a Genesis provider about Vitamin C injection.
Schedule a consultation. Physician-led, evidence-graded.
Or keep reading: See the Skin Longevity & Glow stack