Reviewed by Dr. Caio Trentin, MD ·
The Standard: nutrients, delivered by injection
A vitamin injection places a defined dose of one or more nutrients — commonly B12, B-complex, vitamin C, or a customized blend — into muscle or vein. The appeal is absorption. Oral supplements depend on a healthy gut, adequate stomach acid, and intact transport proteins; the injected route sidesteps those variables and makes the full dose available. That matters when absorption is genuinely impaired. It matters far less when it isn't. For most people eating a varied diet with a functioning gut, an injection and a well-chosen oral supplement reach a similar endpoint. The honest framing is that injection is a delivery method, not a different medicine.
What they are: a real tool for real deficiency
Vitamin injections do one thing well — they correct or supplement nutrient status quickly and reliably. B12 injection is a long-established treatment for B12 deficiency, particularly in people who cannot absorb it orally, such as those with pernicious anemia, certain gastrointestinal conditions, prior bariatric surgery, or long-term use of specific medications. Some people on plant-based diets, and some older adults, fall into measurable deficiency as well. In those settings, replacing the nutrient resolves the symptoms that the deficiency caused — fatigue, low energy, and neurological complaints tied to that specific shortfall. The benefit is real because the deficiency is real. That is the entire logic: identify a documented gap, then close it.
What they aren't: a fix for symptoms without a cause
Vitamin injections are not a treatment for tiredness, stress, or low energy in a person whose nutrient levels are normal. Topping up a vitamin you already have in sufficient amounts does not raise you above baseline — the body excretes the excess of water-soluble vitamins, and stores or, at high enough doses, is harmed by the excess of fat-soluble ones. They are not a detox, an immune booster you can count on, a hangover cure, or a weight-loss tool, despite how they are frequently marketed. They are also not risk-free. Injections carry the ordinary risks of any injection, and high doses of certain nutrients have their own ceilings and interactions. The marketing usually skips that part. FORMA does not. A 'feel better' promise attached to a nutrient you don't lack is the clearest sign a recommendation is being driven by a menu rather than by medicine.
The FORMA approach: test, then treat
FORMA does not sell a standing menu of branded drips. Dr. Trentin's background is internal medicine, and vitamin injections are handled the way any internist handles a possible deficiency — history first, then objective evidence. If your symptoms and your story suggest a specific shortfall, the answer is to confirm it, often with bloodwork, before injecting anything. When a deficiency is documented, replacement is appropriate and the route is chosen to fit your absorption and your goals. When levels are normal, the more useful conversation is about what is actually causing the symptom — sleep, thyroid, iron, mood, medication, or something else — rather than reaching for an injection that won't move a normal number. Every consultation and every injection at FORMA is performed by Dr. Trentin personally, not by a delegated injector, so the person assessing whether you need a nutrient is the same person administering it. The right plan is individualized and determined at consultation. If you've been told a vitamin drip will fix fatigue or 'boost' you, bring that question to a consultation — the more valuable answer is often a real diagnosis.
Questions
Do I need bloodwork before a vitamin injection?
Often, yes. The honest way to recommend a nutrient is to confirm a need for it. Dr. Trentin reviews your history and, where it's warranted, objective testing before injecting anything — so the treatment targets a real shortfall rather than a guess. Whether testing is needed is determined at consultation.
Will a vitamin injection give me more energy if my levels are normal?
Generally not. If a nutrient is already at a sufficient level, adding more does not push you above baseline — the body clears the excess. Persistent fatigue with normal nutrient levels usually points to a different cause worth investigating, which is exactly what a consultation is for.
Is injection better than taking a vitamin by mouth?
Only when oral absorption is genuinely impaired — for example, certain gastrointestinal conditions, prior bariatric surgery, or specific deficiencies like B12. For most people with a healthy gut, a well-chosen oral supplement and an injection reach a similar place. The route is a clinical choice made with your situation in mind.