Evidence-Based Supplement & Herb Guides

Iodine and Thyroid: When It Helps and When It Makes Things Worse

Learn when iodine supports thyroid health, when supplements help, and why too much iodine can worsen hypothyroidism, hyperthyroidism, nodules, or autoimmune thyroid disease.

Iodine has an unusual reputation in thyroid health. It is essential, but it is not gentle. The thyroid needs iodine to make T4 and...

Iodized Salt vs Sea Salt: Thyroid Support, Iodine Needs, and Sodium Tradeoffs

Learn whether iodized salt or sea salt is better for thyroid support, how much iodine you actually need, and how to balance iodine intake with smart sodium limits for everyday health.

Salt has become a surprisingly emotional food. For some people, sea salt feels cleaner and more natural. For others, iodized salt sounds old-fashioned or...

Irregular Periods: Hormone Causes, Common Tests, and Next Steps

Learn what irregular periods can mean, which hormone causes are most common, what tests doctors often order, and when cycle changes need faster evaluation or treatment.

A menstrual cycle rarely follows a perfect calendar, but there is a difference between normal variation and a pattern that signals ovulation or hormone...

Kidney Stones and Calcium: When High Calcium Is the Cause

Learn when kidney stones point to high calcium in the blood, how hyperparathyroidism fits in, which tests matter most, and how to prevent recurrence without making calcium mistakes.

Many people hear they have a “calcium stone” and immediately assume they must be eating too much calcium. That sounds logical, but it is...

Late-Night Eating and Hormones: Blood Sugar, Cortisol, and Morning Hunger

Learn how late-night eating affects blood sugar, cortisol, sleep, and morning hunger, plus practical ways to reduce cravings, improve meal timing, and support steadier hormone rhythms.

Late-night eating often gets framed as a simple discipline problem: eat earlier, sleep better, lose weight. Real life is rarely that neat. Evening hunger...

Leptin Resistance: Hunger, Weight Gain, and What Helps

Learn what leptin resistance is, why it can drive hunger and weight gain, how it overlaps with insulin resistance and poor sleep, and what practical strategies can actually help.

There is a particular kind of hunger that feels less like simple appetite and more like a signal that never fully turns off. You...

Levothyroxine and Coffee: How Long to Wait and What Affects Absorption

Learn how long to wait between levothyroxine and coffee, why absorption changes, which foods and supplements interfere most, and how to build a routine that keeps thyroid labs more stable.

Levothyroxine looks simple on paper: one tablet, one dose, once a day. In real life, it is one of the easiest medications to take...

Levothyroxine and Iron or Calcium: Timing Mistakes That Can Raise TSH

Learn how iron and calcium can block levothyroxine absorption, raise TSH, and mimic treatment failure, plus the timing rules and practical routines that help keep thyroid labs stable.

A thyroid dose can look perfect on paper and still fail in real life because of timing. That is what makes levothyroxine frustrating for...

Levothyroxine at Night vs Morning: Which Works Better and Who Might Prefer Each

Levothyroxine at night versus morning usually comes down to consistency, absorption, and daily routine. Learn which schedule may work better, who might prefer each, and how to switch safely without destabilizing thyroid labs.

For many people with hypothyroidism, levothyroxine becomes the most routine part of the day and also the most inconvenient. It can shape when coffee...

LH and FSH Explained: What They Mean for Fertility and Hormone Health

Understand what LH and FSH mean for fertility and hormone health, including cycle timing, PCOS, primary ovarian insufficiency, male hormone patterns, and how to interpret results without common mistakes.

LH and FSH are two of the most commonly ordered reproductive hormones, yet they are also two of the easiest to misunderstand. A lab...

Liquid Levothyroxine vs Tablets: Absorption, Timing, and Who Might Benefit

Compare liquid levothyroxine and tablets for absorption, timing, coffee and supplement interactions, and learn which patients may benefit most from switching formulations.

Levothyroxine looks simple on paper: replace what the thyroid no longer makes, recheck labs, and move on. In practice, it can be one of...

Low Cortisol Symptoms: Fatigue, Dizziness, and Low Blood Pressure

Learn the real symptoms of low cortisol, including fatigue, dizziness, and low blood pressure, plus the common causes, proper testing, treatment options, and emergency warning signs.

Low cortisol can be surprisingly hard to recognize at first. The early signs are often broad and easy to dismiss: feeling drained for weeks,...

Low Estrogen Symptoms: Mood, Sleep, and Hot Flash Clues

Learn the key low estrogen symptoms, including mood changes, poor sleep, hot flashes, vaginal dryness, and cycle shifts, plus what can mimic them and when to seek treatment.

Low estrogen is rarely just one symptom. It often arrives as a pattern: sleep that becomes lighter and more broken, a shorter fuse, a...

Low Libido in Men: Testosterone, Sleep, and Health Causes

Learn the common causes of low libido in men, from testosterone and sleep apnea to stress, obesity, and medications, plus how doctors evaluate low desire and what treatments actually help.

Low libido in men is often described in blunt terms, but the lived experience is usually more subtle. A man may notice less spontaneous...

Low Libido in Women: Hormones, Stress, and Medical Causes

Low libido in women can be linked to hormones, stress, menopause, medications, pain, thyroid issues, and mood changes. Learn the common causes, useful tests, and treatment paths that make evaluation more practical and personalized.

Sexual desire is not fixed. It rises and falls with sleep, stress, relationship dynamics, physical comfort, life stage, and overall health. That is why...

Low Progesterone Symptoms: Anxiety, Sleep Problems, and Cycle Changes

Understand the real meaning of low progesterone symptoms, including anxiety, sleep problems, spotting, and irregular cycles, plus how testing works, common causes, and when to seek care.

“Low progesterone” has become a popular explanation for a wide range of symptoms, especially anxiety, insomnia, spotting, and irregular periods. Sometimes that idea is...