IV vitamin drips have moved well beyond celebrity wellness culture. In 2026, they are a mainstream offering at medspas across London, booked by professionals, athletes, and anyone who wants to feel and look better faster than oral supplements allow. But the marketing around IV drips often runs ahead of the science.
This guide cuts through the noise. Here is what IV drips actually do, what the research says, and how to decide whether they belong in your wellness plan.
How IV Drips Work
When you take a vitamin orally, it passes through your digestive system before reaching your bloodstream. Absorption rates vary significantly depending on the nutrient, your gut health, and what else you have eaten. Vitamin C, for example, has an oral bioavailability of around 50% at moderate doses, dropping further as the dose increases. At very high doses, the body actively limits absorption.
IV administration bypasses the digestive system entirely. Nutrients are delivered directly into the bloodstream, achieving 100% bioavailability immediately. This is not a marketing claim — it is basic pharmacokinetics. The clinical relevance is that IV delivery allows concentrations of certain nutrients in the blood that are simply not achievable orally.
A 2020 review published in Nutrients confirmed that intravenous administration of vitamin C achieves plasma concentrations 30 to 70 times higher than the maximum achievable through oral supplementation. For nutrients whose therapeutic effects are concentration-dependent — including vitamin C, glutathione, and B vitamins — this difference is clinically meaningful.
What Is in a Standard IV Drip?
At Medspa London, IV drips are formulated based on your health goals. Common ingredients include:
Vitamin C — a potent antioxidant that supports collagen synthesis, immune function, and skin brightness. At IV concentrations, it also neutralises free radicals at a rate not achievable through diet alone.
B Vitamins (B1, B2, B3, B5, B6, B12) — essential for energy metabolism, neurological function, and red blood cell production. B12 deficiency is more common than most people realise, particularly in those following plant-based diets or with gut absorption issues.
Magnesium — involved in over 300 enzymatic reactions in the body. Low magnesium is associated with fatigue, poor sleep, muscle cramps, and headaches. A 2018 study in Nutrients found that up to 50% of the UK population consumes less than the recommended daily amount of magnesium.
Zinc — supports immune function, wound healing, and skin health. IV zinc is particularly useful for clients recovering from illness or with known deficiency.
Glutathione — the body’s master antioxidant. It plays a central role in cellular detoxification and has a well-documented brightening effect on the skin by inhibiting melanin synthesis. More on this below.
Saline or Lactated Ringer’s solution — the base fluid that carries the nutrients and provides hydration simultaneously.
What Is NAD+ and Why Is It Trending?
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every cell of the body. It is essential for energy production, DNA repair, and cellular communication. NAD+ levels naturally decline with age — research published in Cell Metabolism in 2013 showed that NAD+ levels in muscle tissue drop by approximately 50% between the ages of 20 and 50. This decline is now understood to be a significant driver of age-related fatigue, cognitive decline, and reduced cellular repair capacity.
IV NAD+ delivers this coenzyme directly into the bloodstream, bypassing the conversion processes required when taking NAD+ precursors orally (such as NMN or NR). The result is a rapid increase in cellular NAD+ levels.
Clients booking NAD+ drips at Medspa London most commonly report:
- Significantly improved energy and mental clarity within 24 to 48 hours
- Better sleep quality over the days following treatment
- Reduced post-exercise recovery time
- Improved mood and reduced brain fog
A 2023 clinical trial published in npj Aging found that IV NAD+ supplementation over a 6-week period significantly increased blood NAD+ levels and was associated with improvements in subjective energy, cognitive function, and physical performance markers in adults over 40.
NAD+ drips take longer than standard vitamin drips — typically 2 to 4 hours — because the infusion rate needs to be managed carefully to avoid side effects including flushing, nausea, or chest tightness. At Medspa London, Nurse Nadia monitors every NAD+ session to ensure your comfort and safety throughout.
The Glow Drip: What Does It Actually Do for Your Skin?
The “glow drip” — typically a high-dose combination of vitamin C, glutathione, and B vitamins — has become one of the most requested IV formulations in London medspas. The skin benefits are rooted in real biochemistry.
Glutathione inhibits the enzyme tyrosinase, which is responsible for melanin production. This is the mechanism behind its skin-brightening effect. A 2017 randomised controlled trial published in Clinical, Cosmetic and Investigational Dermatology found that glutathione supplementation significantly reduced melanin index scores across all skin types after 12 weeks, with IV delivery producing faster results than oral supplementation.
Vitamin C at IV concentrations supports collagen synthesis by acting as a cofactor for prolyl hydroxylase and lysyl hydroxylase — the enzymes responsible for stabilising collagen’s triple helix structure. Without adequate vitamin C, collagen production falls. At IV concentrations, this process is optimised.
Results from a glow drip are noticeable within 24 to 72 hours and typically last 2 to 4 weeks depending on lifestyle factors. Regular sessions — usually monthly — maintain the effect consistently.
Is IV Therapy Safe?
IV therapy administered by a qualified medical professional is safe for the vast majority of clients. At Medspa London, all IV drips are administered by Nurse Nadia, a registered medical professional with training in IV therapy and clinical safety protocols.
Before any IV drip, Nadia conducts a health assessment to check for contraindications. IV therapy is not suitable for clients with certain kidney conditions, G6PD deficiency (relevant for high-dose vitamin C), or those who are pregnant. Any reputable medspa will screen for these before treatment.
The risks associated with IV therapy when administered correctly are low. Bruising or discomfort at the insertion site is the most common side effect. Infection risk is negligible when proper sterile technique is used.
What you should avoid is any clinic offering IV drips without a health assessment and without medical supervision during the infusion. In the UK, the Care Quality Commission (CQC) has highlighted the importance of clinical oversight for IV treatments, and choosing a nurse-led clinic like Medspa London removes this concern entirely.
How Often Should You Get an IV Drip?
This depends on your goal.
For general wellness and energy support, most clients benefit from a drip every 4 to 6 weeks. For skin brightening with glutathione, a course of 4 to 6 sessions spaced 2 weeks apart is the standard protocol before moving to monthly maintenance. For NAD+, an initial course of 4 sessions over 2 weeks followed by monthly top-ups is the most common approach for sustainable results.
Nadia will assess your health goals and current status at your consultation and recommend a schedule that makes clinical sense for you — not one designed to maximise the number of appointments you book.
Final Thoughts
IV drips work. The science is solid, the bioavailability advantage over oral supplements is real, and the results — particularly for energy, recovery, and skin brightness — are experienced by a significant majority of clients who complete a proper course. The key is choosing a clinic where treatment is medically supervised, individually assessed, and administered by someone qualified to manage your care if anything unexpected occurs.
At Medspa London, every drip starts with a conversation and ends with a plan that is built around your body and your goals.
