What an IV drip actually does
When you swallow a vitamin, it passes through your gut and liver before reaching your bloodstream. Absorption varies with the nutrient, your gut health and what else you’ve eaten. An IV delivers nutrients straight into a vein, so blood levels rise quickly and predictably.
That sounds like an obvious advantage. But higher blood levels don’t automatically mean better health. Your body tightly regulates most nutrients. When you already have enough of a water-soluble vitamin, like vitamin C or most B vitamins, your kidneys simply excrete the excess within hours.
Where the evidence is strong
Intravenous or injected nutrients are standard medical care in situations like these:
- Iron deficiency when oral iron hasn’t worked, isn’t tolerated, or levels need to rise quickly, such as in late pregnancy or before surgery. IV iron is prescribed by a doctor after blood tests.
- Vitamin B12 deficiency, especially when the gut can’t absorb B12 (for example, in pernicious anaemia or after some types of bowel surgery). In Australia this is usually given as an intramuscular injection rather than a drip.
- Malabsorption conditions, such as some cases of inflammatory bowel disease, coeliac disease or after bariatric surgery, where a doctor confirms you can’t absorb enough from food or tablets.
- Dehydration from illness, where fluids and electrolytes are replaced intravenously.
What these have in common: a diagnosed problem, confirmed by testing, with a clear reason why oral treatment isn’t enough.
Where the evidence is limited or mixed
Most wellness drips fall into this category.
“Myers’ cocktail” style drips (a mix of magnesium, calcium, B vitamins and vitamin C) are among the most popular. The best-known randomised controlled trial tested them in people with fibromyalgia. Both the drip group and the placebo group improved, and the difference between them wasn’t statistically significant. That large placebo effect is a common theme in this area.
Energy, fatigue and “immune boosting” claims in healthy people aren’t well supported by controlled trials. Fatigue has many causes, including iron deficiency, thyroid problems, sleep disorders and depression. A drip won’t find or fix the underlying cause.
Hangover and athletic recovery drips mainly work through fluid replacement. Drinking water and an electrolyte drink achieves much the same thing for most people.
High-dose IV vitamin C is being studied in several areas, including alongside cancer treatment. Research is ongoing and results so far are mixed. Notably, a large 2022 trial in patients with sepsis (LOVIT) found vitamin C did not help and may have caused harm. Anyone having cancer treatment should only consider IV vitamin C with their oncologist’s agreement.
The risks are small but real
IV therapy is a medical procedure, not a beauty treatment. Possible risks include:
- bruising, pain or inflammation of the vein at the cannula site
- infection, which is rare when strict sterile technique is used
- fluid overload in people with heart or kidney conditions
- haemolysis (breakdown of red blood cells) from high-dose vitamin C in people with G6PD deficiency, which is why screening matters
- kidney stones, as high-dose vitamin C can increase oxalate
- interactions with medicines you already take
This is why a proper health assessment should always come first.
How we approach IV therapy at Health Society Co.
IV therapy at our clinic is for adults, by assessment only. Before anything is recommended, a Registered Nurse reviews your health history, current medicines and any recent blood tests. If something like persistent fatigue points to an undiagnosed problem, we’ll suggest you see your GP first.
Sometimes the right answer is “you don’t need this”. We’d rather tell you that than sell you something that won’t help. For many people, our clinical nutrition and naturopathy consultations are a better starting point for improving nutrient levels through food and, where appropriate, oral supplements.
Questions to ask any IV provider
- Who will assess me, and what are their qualifications?
- What tests do you need before treatment, and why?
- What specifically is in the drip, and what’s the evidence for it in someone like me?
- Who administers it, and what happens if I have a reaction?
- Will you share the details with my GP?
If a provider can’t answer these clearly, that’s worth noting.
