Myers Cocktail for Energy and Immunity: Does It Really Work?
.png&w=3840&q=75)
Ask most people why they book a Myers' Cocktail and you'll hear one of two answers: "I need more energy" or "I want to stop getting sick." It's the classic wellness drip, and energy and immunity are, by far, the two benefits it's most associated with.
But do the ingredients actually deliver on either promise? That depends entirely on one thing: whether your body is deficient in them to begin with. This article looks specifically at what the research says about the Myers' Cocktail for energy and immune support — separating the well-established science from the marketing language.
For the full history of the Myers' Cocktail, its ingredients, and what the clinical trials show, see our complete guide to the Myers' Cocktail.
The Energy Claim: What the Evidence Actually Shows
The Myers' Cocktail contains a full spectrum of B vitamins, including B12, all of which play a genuine, well-documented role in cellular energy metabolism. B vitamins are essential cofactors in the biochemical pathways that convert food into usable energy, and B12 specifically is required for red blood cell formation and nervous system function.
Here's the key distinction: this is true regardless of whether you're deficient. The question that actually matters is what happens when you add more B vitamins to a body that already has enough.
A systematic review and meta-analysis of 16 randomised controlled trials involving 6,276 participants examined the effects of B12 supplementation — alone or as part of a B-complex — on fatigue, cognitive function, and depressive symptoms in people without an overt B12 deficiency or advanced neurological disorder. The findings were clear: no evidence of benefit was found for cognitive function, depressive symptoms, or fatigue in this population (PMC, systematic review and meta-regression).
In other words, if your B12 and B-vitamin levels are already adequate, the research does not support the idea that more B12 will make you feel more energetic. The energy benefit is real — but it belongs to people correcting an actual deficiency, not to the general population topping up levels that are already normal.
This lines up with the broader concern raised by the Drug and Therapeutics Bulletin's 2023 review of IV vitamin therapy, which noted that high-dose infusions like the Myers' Cocktail are commonly promoted to "increase energy," but found a lack of high-quality evidence that this benefit exists for people without a specific, diagnosed deficiency (DTB, 2023).
The practical takeaway: if you've been feeling persistently fatigued, the more useful first step is a blood test to check whether B12, iron, or vitamin D levels are actually low. If they are, correcting the deficiency has a strong evidence base behind it. If they're normal, an energy drip is unlikely to move the needle much further.
The Immunity Claim: What the Evidence Actually Shows
Vitamin C is the headline ingredient in most immunity-focused marketing, and the Myers' Cocktail delivers it in high doses. Vitamin C does have an established role in immune cell function and acts as an antioxidant — that part isn't in question.
What's less clear is whether taking more of it, especially via IV, meaningfully reduces your chances of getting sick. The most extensively studied evidence on this comes from oral vitamin C research rather than IV-specific trials, so some extrapolation is needed — but it's worth understanding what that evidence shows.
A well-known Cochrane review, updated across multiple analyses, pooled data from placebo-controlled trials testing regular vitamin C supplementation at 0.2g per day or more. It found that regular vitamin C had no effect on the incidence of the common cold in the general population, based on 29 trial comparisons involving over 11,000 participants. It did find a modest, consistent reduction in the duration of cold symptoms — roughly 9.4% shorter colds with regular supplementation. Interestingly, the benefit was considerably larger in a specific subgroup: five trials involving 598 people exposed to short periods of extreme physical stress (marathon runners, skiers, and similar) found that vitamin C roughly halved their risk of catching a cold (Cochrane review, Hemilä & Chalker).
The Drug and Therapeutics Bulletin's 2023 review reached a parallel conclusion for IV vitamin infusions specifically: high-dose mixtures marketed to "boost immunity" lack high-quality evidence of benefit in people without a specific, diagnosed deficiency (DTB, 2023).
The practical takeaway: vitamin C isn't useless — the evidence suggests a genuine, if modest, effect on cold duration, and a more meaningful effect specifically around periods of intense physical exertion. But the idea that a vitamin C infusion will stop you getting ill in general isn't well supported. If you're someone who trains hard, travels frequently, or is regularly exposed to physical stress, the evidence is more encouraging for you specifically than for the general population.
So Does the Myers' Cocktail "Work"?
The honest answer is: it depends on what you're using it for.
Where the evidence is more supportive: correcting a genuine, tested deficiency in B12, other B vitamins, or vitamin C. Supporting hydration and electrolyte balance, particularly around illness, travel, or physical exertion. General nutrient support for people with absorption issues that make oral supplementation less effective.
Where the evidence is weaker: using it as a general energy booster when your nutrient levels are already normal. Using it as immune "insurance" to prevent illness outside of specific high-exertion contexts. Expecting IV administration specifically to outperform oral supplementation for people without absorption problems.
None of this means the Myers' Cocktail is without value — many people find it a pleasant, relaxing way to support hydration and general wellness, and the ingredients themselves are well-tolerated when administered by qualified professionals. We just don't think it's honest to promise it will meaningfully boost your energy or immunity if your levels are already within a healthy range.
How to Know If You'd Actually Benefit
The most reliable way to find out whether an energy or immunity drip is likely to help you is testing, not guessing. A comprehensive blood test can check your B12, ferritin (iron stores), and vitamin D levels, giving you a clear picture of whether a genuine deficiency is contributing to your symptoms.
Certain groups are more likely to have low levels worth checking: vegetarians and vegans (B12 and iron), people with gastrointestinal conditions affecting absorption, women with heavy menstrual periods (iron), and anyone under sustained physical or work-related stress. If your results come back low, targeted correction — whether through our vitamin B12 injections, B complex injections, or iron infusion — has a genuinely stronger evidence base than a general wellness drip.
What's In Our Myers' Cocktail
Our Myers' Cocktail IV Drip includes calcium gluconate, magnesium sulfate, selenium, zinc, a full B-vitamin complex, and 7.5g of vitamin C — priced at £290.
If your goal is specifically energy, our Energy Boost IV Drip is formulated with a heavier concentration of B vitamins and amino acids. If immune support around a specific event or period of stress is the priority, our Immunity IV Drip combines higher-dose vitamin C with zinc and selenium.
Safety and Administration
All infusions at our Mayfair clinic are administered by NMC-registered nurses with NHS and private hospital experience. Sessions typically take 30–45 minutes, and our team can talk through your health history beforehand to check for anything that might make IV therapy unsuitable.
What to Do Next
If persistent fatigue or frequent illness is affecting you, the most useful first step isn't necessarily an IV drip — it's finding out whether you actually have a deficiency. Book a blood test to get a clear picture, or if you'd simply like to try the Myers' Cocktail as part of your general wellness routine, book a treatment at our Mayfair clinic.
Frequently Asked Questions
Does the Myers' Cocktail really boost energy?
The B vitamins in the Myers' Cocktail play a genuine role in energy metabolism, but a large systematic review of 16 randomised trials found no evidence of improved fatigue, cognitive function, or mood from B12 or B-complex supplementation in people without an existing deficiency. If your B12 levels are already normal, the evidence doesn't support a meaningful energy boost. If you're deficient, correcting it can genuinely help — a blood test is the way to find out.
Does the Myers' Cocktail boost the immune system?
Vitamin C supports normal immune cell function, but a Cochrane review of placebo-controlled trials found that regular vitamin C supplementation had no effect on the incidence of the common cold in the general population, though it modestly reduced cold duration. The benefit was considerably stronger specifically in people under intense physical stress, such as endurance athletes. General "immune boosting" claims for the average person aren't strongly supported by the evidence.
Who is most likely to benefit from the Myers' Cocktail?
People with a genuine, tested deficiency in B vitamins, iron, or vitamin C are most likely to notice a meaningful difference. Those under significant physical stress — such as endurance athletes or frequent travellers — may also see more benefit from the vitamin C component specifically. For people with normal nutrient levels, the Myers' Cocktail is best thought of as general wellness support rather than a targeted fix.
Should I get a blood test before booking a Myers' Cocktail?
It isn't required, but it's the most reliable way to know whether you have an actual deficiency that the drip could meaningfully address. Without testing, you're essentially guessing at what your body needs.
Is IV vitamin C better than taking vitamin C tablets for immunity?
Most of the strongest evidence on vitamin C and immunity comes from oral supplementation studies, not IV-specific trials. There isn't strong evidence that IV administration provides an immune benefit beyond what oral vitamin C already offers for people without absorption issues. IV delivery may still be useful for those with malabsorption or for convenience, but it isn't proven to outperform oral vitamin C for immune outcomes specifically.
What's the difference between the Myers' Cocktail and your Energy Boost or Immunity drips?
The Myers' Cocktail is the original, broad-spectrum formula. Our Energy Boost and Immunity drips are more targeted variations with adjusted ingredient ratios for those specific goals.
