What Is Bioavailability and Why It Matters for Your Supplements | TUH #252

About this video

Brecka explains bioavailability — the share of a nutrient that, he says, actually reaches the bloodstream in a usable form — and argues supplement form matters as much as the nutrient itself. Using creatine, folate and B12, and magnesium as examples, he claims cheaper common forms require conversion steps that, he argues, genetic variants can impair, while already-active or better-absorbed forms bypass those steps. He closes by urging viewers to check ingredient forms on their labels and suggesting critics of supplements are, in his view, only half right.

Key takeaways

• Brecka defines bioavailability as the percentage of a nutrient the body can actually use
• Brecka claims genetic variants can block conversion of synthetic folate and B12 forms
• Brecka argues some magnesium forms are, he says, poorly absorbed compared with others
• Brecka presents ingredient form, not dose alone, as the deciding factor in supplement value

Episode details: published March 12, 2026 · 15.4K views · 10:01 long. Summary written by Self Growth Videos from the episode itself. Gary Brecka is a commercial health figure, not a physician. The claims described are Brecka’s or his guests’, presented for education — not medical advice and not endorsed by Self Growth Videos. Consult a qualified professional before changing your own health practices.

← Previous: Why Your Supplements Aren’t Working · Next: The Soil Problem No One Talks About →

All Gary Brecka videos · Gary Brecka profile · The Ultimate Human (official site)