Guides
Answer-first guides to common supplement questions. Every claim carries an evidence grade (A to D) and a link to the study behind it. How we grade.
Ashwagandha for Stress: Dose, Form, and Safety
Ashwagandha for stress has fair but imperfect evidence. In small trials lasting about 8 weeks, root extract at 240 to 600 mg a day lowered stress and anxiety scores more than placebo (grade B), though results varied widely and one 2025 review found no clear effect on perceived stress. Rare liver injury and thyroid overactivity have been reported. NIH advises against it in pregnancy and with thyroid or autoimmune disorders.
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Supplements and Kidney Health in Diabetes: What's Studied, What to Avoid
Supplements have not matched prescribed medicines at protecting kidneys in diabetes, and the 2022 KDIGO guideline relies on medicines. In a 5-year trial of 1,312 adults with type 2 diabetes, vitamin D3 and omega-3 made no clear difference to kidney function (grade B). Ginkgo and alpha-lipoic acid, added to blood-pressure medicines, lowered urine albumin, a lab marker (grade C). Talk to your nephrologist (kidney doctor) first: potassium salt substitutes, some herbs and high-dose vitamin C can harm damaged kidneys.
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Supplements for Dry Mouth: What Works, What Doesn't, and What to Check First
No pill or capsule has good evidence for treating dry mouth. The best-tested option is a product you spray in your mouth: a 1% malic acid spray eased symptoms and raised saliva flow in five small two-week trials (grade B). Omega-3 capsules did no better than a placebo oil. Medicines are a leading cause of dry mouth, especially in people over 60, so check them first with your pharmacist or prescriber.
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Supplements for Gingivitis: What a "Gingivitis Formula" Can and Can't Do
No pill or "gingivitis formula" can stand in for plaque removal, which is what reverses gum inflammation. Among supplements you swallow, vitamin C has the best support (grade B), and it helps mostly people whose vitamin C is low. Probiotic lozenges gave mixed results (grade C). Many other formula ingredients, such as CoQ10 and aloe, were tested as gels or rinses, not capsules. Gums that bleed for two weeks or more need a dental visit.
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Supplements for Lactose Intolerance: Lactase, Probiotics, and What to Skip
For lactose intolerance, lactase enzyme taken right before dairy has the best support: small placebo-controlled trials found less gas, bloating and breath hydrogen (grade B), though it fails for some people. Probiotic capsules have weak, strain-by-strain evidence (grade C). Most adults can handle about 12 g of lactose, roughly one cup of milk, with no pill at all. If you cut dairy, replace its calcium, and see a doctor about weight loss or blood in your stool.
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