A naturopathic doctor (ND) in Ontario approaches fatigue and low energy by ruling out the common medical causes (iron deficiency, thyroid issues, B12 deficiency, vitamin D deficiency, blood sugar dysregulation, sleep loss), addressing the daily inputs that drive energy, and adding supplementation or prescription support where labs and the case justify it. The most common cause of “I’m tired all the time” is not exotic; it is foundational.
This guide covers the common patterns behind fatigue, the labs that matter, why “adrenal fatigue” is misleading, and what working with an ND looks like.
The most common drivers of fatigue in women
Used carefully, “fatigue” usually traces to one or more of these:
- Low iron and ferritin. Common in menstruating women due to monthly blood loss. Ferritin below 30 ng/mL often produces symptoms; below 50 is suboptimal for many people.
- Vitamin D deficiency. Common in Ontario, especially November through April.
- B12 deficiency. More common in vegetarians, vegans, and people on long-term acid-suppressing medications.
- Hypothyroidism or subclinical hypothyroidism. Slow metabolism, cold intolerance, hair shedding, constipation alongside fatigue.
- Blood sugar swings. Energy crashes 2 to 3 hours after meals, especially carb-heavy ones.
- Sleep loss or fragmented sleep. Often the largest single contributor.
- Undereating, especially low protein. Common in women trying to manage body composition through restriction.
- Perimenopause. Sleep disruption, hormonal fluctuation, and shifting energy patterns in the 5 to 10 years before menopause.
- Chronic stress patterns. Sustained sympathetic load that affects sleep, appetite, and mood.
- Less commonly: anemia of inflammation, celiac disease, sleep apnea, depression, postural orthostatic tachycardia syndrome (POTS), long COVID.
A thorough workup tries to identify which of these are at play, often more than one.
Why “adrenal fatigue” is the wrong frame
“Adrenal fatigue” is a trend term, not a clinical diagnosis. The actual adrenal conditions are:
- Cushing’s syndrome: cortisol excess, with specific physical findings (central weight gain, purple striae, moon face) and lab findings.
- Addison’s disease: primary adrenal insufficiency, with low cortisol, electrolyte changes, and a specific clinical picture. Uncommon.
What gets labelled “adrenal fatigue” is usually a mix of low iron, low vitamin D, subclinical thyroid issues, sleep loss, undereating, and stress. Buying ashwagandha and a salt cocktail without running blood work skips the actual workup.
If a four-month ashwagandha protocol has not changed anything, the question is what was missed on the lab side.
The labs that matter
A reasonable starting workup for fatigue:
- CBC. Rule out anemia.
- Ferritin and iron studies. Ferritin is the most useful single marker for iron stores; a normal CBC does not rule out iron deficiency.
- Full thyroid panel. TSH, free T3, free T4, TPO antibodies.
- Vitamin D (25-OH).
- B12 and folate.
- Fasting glucose and A1C. Screen for insulin resistance or early diabetes.
- Lipid panel.
- Inflammatory markers when relevant: hs-CRP.
- Hormone panel if symptoms suggest perimenopause or PMOS (formerly PCOS).
- Cortisol or DHEAS in specific cases, drawn at the right time of day.
- Celiac screening if there are any gut symptoms or family history.
Most of these can be requisitioned through your family doctor under OHIP. Your ND can interpret the results and decide whether further testing is justified. See the lab test glossary for what each test measures.
How an ND works through a fatigue case
A typical workflow:
- Detailed history. Sleep patterns, diet, exercise, stress, medications, menstrual cycle, recent illnesses, mood, work and shift schedules. See what to expect at your first naturopath visit.
- Targeted lab work. Order or review the foundational panel.
- Foundations. Address sleep, protein, hydration, blood sugar stability, daylight exposure, movement, and stress before more targeted interventions.
- Targeted supplementation. Based on labs: iron, vitamin D, B12, magnesium, omega-3, others as indicated.
- Prescription support where indicated. Levothyroxine for clinical hypothyroidism, managed through your MD. Iron infusion through your MD if oral iron is not enough.
- Reassessment at 8 to 12 weeks. Iron, vitamin D, and B12 are rechecked at this point to confirm correction.
Foundations that matter most for energy
The day-to-day inputs that shift energy more than any single supplement:
- Sleep. 7 to 9 hours, consistent bedtime and wake time, light exposure first thing in the morning, screens off an hour before bed.
- Protein at every meal. 30 to 40 g per meal stabilizes blood sugar and supports muscle and neurotransmitter production.
- Adequate calories. Persistent undereating drives fatigue, hair loss, low libido, and irregular cycles. The fix is often eating more, not less.
- Strength training. Building muscle improves insulin sensitivity, sleep quality, and daytime energy. Cardio alone is often not enough.
- Daylight in the morning. 10 to 20 minutes within an hour of waking improves circadian rhythm and evening sleep.
- Caffeine timing. Cut off by early afternoon. Caffeine is metabolized slowly enough to disrupt sleep onset even when it does not feel like it.
These are the foundations Dr. Mariah, ND addresses before recommending any “energy supplement.”
Common supplement protocols, used with reasons
- Iron when ferritin is low. Form matters: bisglycinate or ferrous fumarate are typically better tolerated than ferrous sulfate. Reassess at 8 to 12 weeks.
- Vitamin D when 25-OH levels are below the target range. Dose calibrated to baseline level, not blanket-recommended.
- B12 as methylcobalamin or hydroxocobalamin in deficient cases. Severe deficiency may need injections through your MD.
- Magnesium glycinate or threonate for sleep and stress patterns.
- Adaptogenic herbs in specific cases, after foundations and labs have been addressed. Not a default.
Test, do not guess. A blanket vitamin D or iron recommendation without a serum level is a missed step.
When fatigue needs your MD first
See your family doctor first for:
- New, severe, or progressively worsening fatigue.
- Fatigue with chest pain, shortness of breath at rest, fainting, or significant weight loss.
- Suspected sleep apnea (loud snoring, witnessed apneas, daytime sleepiness despite long sleep).
- Suspected major depression with significant functional impairment.
Most of these need OHIP-covered investigation that an ND cannot directly initiate.
Cost and coverage
A first visit is 60 to 75 minutes and is not covered by OHIP. Most extended health plans cover ND visits in part or in full. The foundational labs (iron, thyroid, vitamin D, B12, A1C) can be requisitioned by your family doctor under OHIP.
For details, see the cost of a naturopath in Ontario and is a naturopath covered in Ontario.
Booking a consultation
Dr. Mariah, ND has a clinical focus on fatigue and low energy, including iron deficiency, thyroid concerns, sleep issues, and the HPA-axis patterns that get mislabelled “adrenal fatigue.” Visits are available at WOMB Woodstock and InsideU Woodstock, or virtually anywhere in Ontario.
When you are ready, reserve a consultation. Bring any recent labs.