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Oral supplements work. IV therapy works. They’re not in competition — they target different problems on different timelines. The honest comparison: when oral is enough, when IV is genuinely better, and when paying for IV is overkill.

The actual bioavailability difference

Most oral vitamins and minerals are absorbed at 10–30% of the dose ingested, with the rest excreted. Vitamin C tops out at about 18% absorption from oral doses above 1 gram. Magnesium is closer to 30–40% under optimal conditions and worse with stress, antacids, or low stomach acid. B12 absorption requires intrinsic factor and drops significantly in adults over 50, in people on metformin or proton-pump inhibitors, and in vegans.

An IV delivers 100% of the dose directly into circulation. That’s not marketing — it’s plumbing.

When oral supplements are enough

• Routine, baseline supplementation — daily vitamin D, a B-complex, magnesium glycinate at night. Oral is the right answer; an IV would be expensive overkill.
• Long-term correction of a documented deficiency — once labs confirm a need, oral repletion over weeks/months is usually cheaper and just as effective.
• Maintenance after a labwork-proven correction — oral keeps you there.
• Healthy adult with a varied diet — for most micronutrients, food + a basic multi is fine.

When IV genuinely wins

• Rapid rehydration. No oral approach matches a liter of saline. Hangovers, food poisoning, heat exhaustion, post-flight, post-event — IV is straightforwardly faster.
• Acute nutrient depletion. After a heavy training week, a stomach bug, or post-illness, IV brings you back to baseline in 45 minutes instead of a week of oral.
• Impaired GI absorption. Bypass an irritated, vomiting, or otherwise non-functional gut.
• Vitamin C and glutathione at therapeutic doses. Oral simply cannot reach the plasma levels of an IV. For these molecules, the route changes the pharmacology, not just the speed.
• NAD+ specifically. Oral NAD+ doesn’t reach NAD+; it gets broken down in the gut. NAD precursors (NR, NMN) work orally, but if you want NAD+ specifically, IV (or injection) is the route.
• B12 in malabsorbers. Pernicious anemia, severe vegan deficiency, post-bariatric surgery — oral can’t fix it. Injection or IV is standard of care.

Side-by-side comparison

Goal	Oral works?	IV worth it?
Daily wellness baseline	Yes	No
Rehydration after hangover	Slow	Yes
Post-flight recovery	Slow	Yes
Long-term B12 correction (no malabsorption)	Yes	No
High-dose vitamin C (above 1 g)	No	Yes
NAD+ specifically	No	Yes
Glutathione	Marginal	Yes
Magnesium for cramping	Sometimes	Faster
Recovery from a hard event	Slow	Yes
Iron deficiency anemia	Yes (months)	Yes (weeks)

The cost-effectiveness honest take

A bottle of high-quality oral B-complex costs $20 and lasts months. A B-complex IV is $150–$200. If your only goal is “I want to make sure my B-complex levels are okay over time,” oral wins by a mile. If your goal is “I have a wedding in 48 hours and need to look and feel my best,” IV wins.

The clean framing: oral for chronic, IV for acute. Most people who get value from IV therapy use it for specific moments — recovery, travel, event prep, an illness pulling them down — not as a substitute for daily supplementation.

What we’d actually recommend

For most Cabo visitors:

• Keep your oral basics steady — vitamin D, a B-complex, magnesium glycinate at night.
• Book one Hydration drip or Myers’ Cocktail in the first 24 hours of arrival.
• Save a Recovery drip for the morning after the night you know is coming.
• If you have a specific reason for NAD+ or high-dose vitamin C — book it. Otherwise stick to the basics.

Educational content. Supplementation decisions should be individualized; lab testing helps identify what you actually need versus what you don’t.