The Journal
Research-backed articles on lipid science, oral care, skincare and the ingredients behind every CallNature formula.
Skin / Anti-aging
Is Plant-Based Hyaluronic Acid Really Made From Plants? What Vegan HA Actually Is — and How to Read the Label
Most plant-based hyaluronic acid isn't extracted from plants — it's the same molecule, brewed by fermentation. What vegan HA is, and how to read the label.…
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Skin / Anti-aging
Why Is the Skin Under My Eyes Crepey? Thin, Slack or Hollow — the 3-Check Mirror Test That Tells You Which
Crepey under-eye skin is thin skin, slack skin or lost volume — and each needs a different fix. Try the 3-chec…
Dental Health
Why Does My Breath Smell Worse During Allergy Season? The Drip, the Dry Mouth, the Pills or the Nose — the 5-Suspect Check
Breath worse in allergy season? Postnasal drip is the usual blame, but a Mayo ENT says it rarely is. Check the…
Dental Health
Why Are My Gums Dark or Purple? The 7 Patterns — and the 2-Week Photo Test That Shows Which Ones Need a Dentist
Purple, brown, blue-grey or black gums: the 7 patterns that explain them — inflammation, natural melanin, smok…
Scars & Stretch Marks
Why Is My Scar Dark? Brown, Purple or Red — the Glass Test That Tells You, and the Sun Window That Decides It
A dark scar is either brown pigment or red-purple blood vessels — and only one is driven by the sun. The glass…
Skin / Anti-aging
Why Is My Skin So Dry During Pregnancy? What’s Normal, What Helps — and What to Ask Your OB
Dry, tight skin is one of pregnancy’s most common changes. Why it happens, the routine that helps, what to pau…
Nails
Why Do My Nails Split Vertically Instead of Peeling? Onychorrhexis Explained — and the 2-Direction Test
A nail that cracks straight down isn't the same as one that peels in layers, has a habit-tic groove, or a Beau…
Dental Health
Is Triclosan Still in Toothpaste? Why the FDA Never Banned It There — and What Actually Made It Disappear
Triclosan was banned from antibacterial soap in 2016 — not toothpaste. Here's the FDA's actual two-track rulin…
Dental Health
What Does Dry Skin Look Like? How to Spot It on Every Skin Tone — and the 4 Checks That Confirm It
Dry skin looks matte and chalky on lighter tones, gray or ashy on deeper tones. Learn the up-close cues and th…
Nails
Is Acetone Nail Polish Remover Actually Bad for Your Nails? What “Non-Acetone” Really Swaps It For
Acetone dries out nails, but is “non-acetone” remover actually safer? See what solvent really replaces it — fr…
Dental Health
Why Is My Mouth Always Dry? The 6 Causes You Can Change — and the Ones That Need a Doctor
Why is your mouth always dry? The everyday causes — from mouth breathing to common medications — the natural f…
Dental Health
Why Does My Breath Smell After Antibiotics? Thrush, Taste, Tongue or the Infection Itself — the 4-Source Check
Breath off on antibiotics? It’s usually a drug taste, thrush, a coated tongue or the infection itself. Here’s …
Skin / Anti-aging
Why Do I Have 11 Lines Between My Eyebrows? The 3-Position Test That Tells You If They’re Permanent
11 lines come from two small frown muscles. Frown, rest, then spread the skin: the 3-position test shows if yo…
Skin / Anti-aging
Does Gua Sha Actually Get Rid of Wrinkles? What the 4 Studies Really Measured — and the Lines Massage Can’t Reach
No study shows gua sha removes wrinkles. What the 2025 gua sha trial and three other studies actually measured…
Scars & Stretch Marks
Why Is My Scar Indented? The 3 Causes — and the Stretch Test That Tells Them Apart
An indented scar is short of matrix, tethered down, or missing volume beneath — and each needs something diffe…
Nails
Why Am I Suddenly Allergic to Gel Nails? The Threshold Nobody Warned You About — and the 4-Site Symptom Map
Gel nail allergy isn’t sudden — it’s a sensitisation threshold. The HEMA science, the 4-site symptom map, why …
Nails
Does Biotin Actually Work for Nails? The Only Three Studies — and the Dose Mismatch Nobody Checks
Three small uncontrolled studies from 1989–1993 are the whole evidence base. What they found, the 2.5 mg vs 5–…
Skin / Anti-aging
Are Seed Oils Bad for Your Skin? Why the Diet Debate Doesn’t Transfer to Your Face — and the Oleic-vs-Linoleic Rule That Actually Decides It
Are seed oils bad for your skin? What sunflower-vs-olive trials found, the oleic-vs-linoleic rule, the high-ol…
Skin / Anti-aging
Is the Comedogenic Scale Accurate? Where the 0–5 Ratings Really Come From — and the 4-Week Test That Beats Them
Where the 0–5 comedogenic ratings really come from, what human trials found, why “non-comedogenic” has no lega…
Dental Health
Why Does My Breath Smell Bad With CPAP? The Leak, the Chamber or the Apnea — the 3-Source Test
Bad breath on CPAP? It’s one of three things: a mouth or mask leak drying you out, the equipment itself, or th…
Dental Health
Does a Tea Tree Oil Mouth Rinse Actually Help Your Gums? What the Small Studies Show — and the Never-Swallow Rule
Tea tree oil rinses may calm gum inflammation, but the evidence is thin — and the oil must never be swallowed.…
Scars & Stretch Marks
When Can You Start Using Scar Cream After Surgery? Why the Answer Ranges From 2 to 6 Weeks — and the 5-Signal Closure Check That Beats the Calendar
Hospitals say 2 weeks, 4 weeks or 6 — because they track wound closure, not the calendar. The 5-signal closure…
Nails
Does Hand Sanitizer Damage Your Nails? Why “It Strips the Oils” Is the Wrong Explanation — and the After-It-Dries Rule
Dermatologists call alcohol hand sanitizer a leading cause of brittle, splitting nails. Why it’s water loss, n…
Dental Health
What Causes Loose Teeth in Adults? The 5 Causes — and How to Tell Which One You Have
Loose teeth in adults always have a cause — usually one of five. How to tell gum disease from grinding, injury…