Taos Trails: Altitude Air Crashing Youth B12?

By Franklin Everett Shaw

January 26, 2026

The crisp mountain air bites at your lungs, even though the sun feels warm on your face. You’re halfway up a Taos trail, the stunning views of the Sangre de Cristo Mountains stretching out before you. But something feels off. More than just the usual exertion, a creeping fatigue is setting in, a mental fog clouding your thoughts. Is it just altitude sickness, or is something else at play?

It’s entirely possible that a B12 deficiency is exacerbating your altitude sickness symptoms while hiking in Taos. This isn’t just about feeling a little tired; it can significantly impact your performance and enjoyment of the trails. Let’s dive into why this happens and what you can do about it.

Altitude sickness, or acute mountain sickness (AMS), occurs when your body struggles to adapt to the lower oxygen levels at higher altitudes. Taos, New Mexico, sits at a base elevation of nearly 7,000 feet, and many popular hiking trails climb significantly higher. This means even seasoned hikers can experience AMS.

Common symptoms include headache, nausea, fatigue, dizziness, and shortness of breath. These symptoms are often attributed solely to the altitude, but B12 deficiency can worsen them.

B12 plays a crucial role in red blood cell production and neurological function. Red blood cells are responsible for carrying oxygen throughout your body. At altitude, your body needs to produce more red blood cells to compensate for the lower oxygen availability. If you’re B12 deficient, your body’s ability to produce these extra red blood cells is compromised, making you more susceptible to altitude sickness.

Neurological symptoms of B12 deficiency, such as fatigue, brain fog, and dizziness, overlap significantly with those of altitude sickness. This makes it difficult to distinguish between the two and can lead to misdiagnosis or inadequate treatment. The result? You “crash” harder and recover slower.

So, how do you know if B12 deficiency is contributing to your altitude sickness in Taos? It’s not always easy, but here are some clues:

Persistent Fatigue: More than just post-hike tiredness. This is a deep, unrelenting fatigue that lingers for days.
Neurological Symptoms: Tingling in your hands or feet, memory problems, difficulty concentrating, or mood changes.
Dietary Restrictions: Vegans and vegetarians are at higher risk of B12 deficiency, as B12 is primarily found in animal products.
Gastrointestinal Issues: Conditions like Crohn’s disease or celiac disease can impair B12 absorption.
Medications: Certain medications, such as metformin (used for diabetes) and proton pump inhibitors (used for acid reflux), can interfere with B12 absorption.

The unique environment of Taos presents specific challenges. The dry air can exacerbate dehydration, further impacting B12 absorption. The intense sun can deplete B vitamins, including B12. The physically demanding trails require optimal oxygen delivery, making B12 deficiency even more problematic.

Here’s a step-by-step guide to address potential B12 deficiency and mitigate altitude sickness on Taos trails:

Step 1: Pre-Hike B12 Testing in Taos

Before hitting the trails, consider getting your B12 levels checked. Several options are available in Taos:

Quest Diagnostics Taos: Offers standard B12 blood tests. You’ll need a doctor’s order.
Holy Cross Medical Center: Your primary care physician can order a B12 test as part of a routine checkup.
Direct-to-Consumer Testing: Companies like Everlywell offer at-home B12 testing kits. While convenient, discuss the results with your doctor.

Aim for a serum B12 level above 400 pg/mL. Levels below 200 pg/mL are considered deficient, and levels between 200-400 pg/mL may indicate a borderline deficiency.

Step 2: Tailored Supplementation Schedule

If you’re deficient or borderline deficient, consider B12 supplementation. Consult with a healthcare professional to determine the appropriate dosage for you.

Oral Supplements: Cyanocobalamin is a common form, but methylcobalamin is often preferred for better absorption. Start with 1000-2000 mcg daily for a few weeks to replenish your stores, then reduce to a maintenance dose of 250-500 mcg daily.
Sublingual Supplements: These dissolve under your tongue and are absorbed directly into the bloodstream, bypassing the digestive system. This can be beneficial if you have absorption issues.
B12 Injections: The most effective way to raise B12 levels quickly. Your doctor can administer these.

Important: Start supplementing weeks before your hike, not the day before. This allows your body to build up its B12 stores.

Step 3: Acclimatization Strategies

B12 supplementation is just one piece of the puzzle. Proper acclimatization is crucial for preventing altitude sickness.

Gradual Ascent: Spend a few days in Taos before attempting strenuous hikes. This allows your body to adjust to the lower oxygen levels.
Hydration: Drink plenty of water. Dehydration can worsen altitude sickness symptoms and impair B12 absorption.
Avoid Alcohol and Sedatives: These can interfere with your body’s ability to acclimatize.
Light Activity: Engage in light exercise, such as walking, to stimulate red blood cell production.
Diet: Eat a balanced diet rich in iron and other nutrients that support red blood cell production.

Step 4: Monitoring for Altitude Sickness and B12 Absorption Issues

Pay close attention to your body while hiking. If you experience symptoms of altitude sickness, descend to a lower elevation immediately.

Be aware that altitude sickness itself can sometimes impair B12 absorption. The stress on your body and potential gastrointestinal issues can interfere with nutrient uptake.

Track Your Symptoms: Keep a journal of your symptoms, including their severity and duration. This can help you identify patterns and determine if B12 supplementation is effective.
Monitor Your Energy Levels: Pay attention to how you feel before, during, and after your hikes. Are you experiencing persistent fatigue despite adequate rest and nutrition?
Consider Repeat Testing: If you’re concerned about B12 absorption, consider getting your levels rechecked after a few weeks of supplementation.

Common Mistakes and Pitfalls

Ignoring Symptoms: Don’t dismiss symptoms as “just being out of shape.” Altitude sickness can be serious.
Overexertion: Pushing yourself too hard too soon can worsen altitude sickness.
Inadequate Hydration: Dehydration is a major contributor to altitude sickness.
Self-Treating: Always consult with a healthcare professional before starting any new supplements or medications.
Assuming B12 is a Cure-All: B12 supplementation is not a substitute for proper acclimatization and other preventative measures.

Real-World Scenario:

Imagine you’re planning a multi-day backpacking trip in the Wheeler Peak Wilderness near Taos. You’ve experienced mild altitude sickness on previous trips. Before this trip, you get your B12 levels checked and discover you’re borderline deficient. You start supplementing with methylcobalamin a month before your trip, gradually increasing your dosage. You spend two days in Taos acclimatizing, drinking plenty of water, and avoiding alcohol. On your hike, you take it slow, listen to your body, and descend if you experience any symptoms of altitude sickness. By taking these proactive steps, you significantly reduce your risk of altitude sickness and enjoy a successful and memorable backpacking trip.

Hiking the stunning trails around Taos is an incredible experience. Don’t let B12 deficiency and altitude sickness ruin your adventure. By understanding the connection between B12 and altitude sickness, getting tested, supplementing appropriately, and acclimatizing properly, you can optimize your performance, prevent “crashing,” and fully appreciate the beauty of the New Mexico mountains. Remember to always consult with a healthcare professional for personalized advice.