Why Your Labs Might Look "Normal" — But You Still Feel Off

If you’re taking levothyroxine and still feel tired, moody, heavy, foggy, or just not yourself, you’re not alone — and you’re not crazy.

Your lab results might say “normal,” but if you’re still experiencing:

• Fatigue or low energy
• Difficulty losing weight
• Depression or anxiety
• Brain fog or forgetfulness
• Cold intolerance
• Hair loss or dry skin
• 
  

…it may be time to look deeper than just your TSH.

What Most People Don’t Know About Thyroid Medication

Levothyroxine (like Synthroid or Euthyrox) contains only T4, the inactive form of thyroid hormone. For your body to actually use it, T4 must be converted into T3 — the active hormone that fuels your metabolism, mood, and energy.

But not everyone converts T4 to T3 well.

This is especially true in:

• Women over 40
• Menopausal and perimenopausal women
• People with stress, inflammation, insulin resistance, or gut/liver issues

What Should You Ask For?

If you’re still feeling off on levothyroxine, ask your provider for a complete thyroid panel, including:

• TSH
• Free T4
• Free T3
• Reverse T3 (optional)
• Thyroid antibodies (if autoimmune disease is suspected)
• 
  

Even if your TSH is normal, a low Free T3 may explain why you still feel hypothyroid.

Why Armour Thyroid or Compounded NDT May Work Better

Unlike levothyroxine, Armour Thyroid is a Naturally Desiccated Thyroid (NDT) medication derived from porcine (pig) thyroid.

It contains:

• T4 + T3
• Additional thyroid cofactors like T1, T2, and calcitonin

These extra components may offer more symptom relief for some patients who don’t convert well on T4 alone.

Some patients also do well on compounded NDT, which is customized to your dose and free of dyes or additives.

Are There Downsides to NDT?

While many feel better on Armour or compounded NDT, it’s not right for everyone.

Pigs have a higher ratio of T3 to T4 than humans. This can feel too stimulating for some people and may cause:

• Palpitations or racing heart
• Hot flashes or sweating
• Diarrhea
• Anxiety or insomnia

In these cases, a slower titration or switching to a synthetic T4/T3 combination may be more appropriate.

What If You’re Vegan or Avoid Pork?

Since Armour and compounded NDT are both made from porcine thyroid, they’re not suitable for everyone. If you avoid animal products for personal or spiritual reasons, a synthetic combo of levothyroxine (T4) and liothyronine (T3) is a good alternative.

While these alternatives can help, I find they don’t offer the same consistent symptom relief for most patients as natural desiccated thyroid.

The Bottom Line

• Normal TSH does not guarantee optimal thyroid function
• Free T3 is the hormone that really drives how you feel
• Some people need more than just levothyroxine
• Armour Thyroid or compounded NDT may be a better option — especially if you're still symptomatic

If you're wondering whether your thyroid medication is truly working for you, it's worth a second look. You deserve more than “normal labs.”

You deserve to feel like yourself again.