Longevity Supplements: A No-Hype Buyer's Guide
A plain-English guide to judging any longevity supplement: what's in it, what form, how much, how that compares with studies, and whether you can trust the label.
OPA Nutrition Blog
Supplement & Wellness Guides
Plain-English guides to CoQ10, magnesium, gut health, sleep, blood sugar and more: what the research says and how to choose the right supplement.
167 articles
AI, Longevity and David Sinclair: What the Research Actually Says
A plain-English look at David Sinclair's ideas, how AI is used in aging research, and where supplements like NR and resveratrol fit.
What Is NAD+? Why Levels Fall With Age and What Supports Them
What NAD+ is, where your body gets it, why levels may drift down with age, and what oral precursor supplements can and can't do.
NAD+ vs NMN vs NR: What's the Difference and How to Choose
NAD+, NMN and NR explained in plain English: what each one is, what human studies show, and how to read a label before you buy.
Heart-Healthy Foods: A Simple Shopping List and Sample Day
The food groups the American Heart Association recommends, a shopping list, a sample day and easy swaps.
Eye Lift Cream Ingredients: What Each One Does and How to Choose
Hyaluronic acid, squalane, peptides, retinol and bakuchiol: what each eye cream ingredient does and how to apply it.
OPA Oxy-Charge (Formerly Oxy-Burn): Ingredients and Safety Guide
Every blend in OPA Oxy-Charge, what the research says about each ingredient, and who should skip a stimulant formula.
OPA Probiotic-40: What's Inside, Price per Day and Who It Suits
What's in OPA Probiotic-40, how to read the label, who should check with a doctor first, and the cost per day.
Magnesium L-Threonate vs Glycinate (and Other Forms): A Complete Guide
L-threonate vs glycinate and six other magnesium forms compared: elemental content, absorption, sleep studies, daily needs, the 350 mg limit and interactions.
Why Are Mangos a Superfood? What the Nutrition Science Shows
Mango nutrition per cup from USDA data, vitamin C, fiber and polyphenols, what small human studies found, mango vs banana, and who should take care.
The Fibers in Mango: Nutrition Facts and Health Benefits
Mango has about 2.6 g of fiber per cup and 5.4 g per fruit (USDA). Covers soluble vs insoluble fiber, a fruit comparison table, dried mango and safety.
Statins and Muscle Symptoms: What Research Shows About CoQ10 and Other Factors
What research shows about statin-associated muscle symptoms, why statin choice belongs to your prescriber, and what CoQ10 and vitamin D trials found.