Size: 60 capsules
Thorne's Riboflavin 5'-Phosphate delivers vitamin B2 in its active coenzyme form—flavin mononucleotide (FMN)—bypassing the conversion step required by standard riboflavin. It supports cellular energy production, mitochondrial function, and normal metabolism of fats, carbohydrates, and proteins. Well-suited for individuals with compromised riboflavin conversion capacity or those seeking a more bioavailable B2 option.
Why It's Worth Considering: Thorne formulates this as the pre-converted phosphorylated form, which may be more readily utilized than conventional riboflavin, particularly for those with certain metabolic variations. The 60-capsule format reflects Thorne's practitioner-grade manufacturing standards.
| Feature | Methylated (active) | Standard | Synthetic (cheap) |
|---|---|---|---|
| B12 Form | Methylcobalamin | Hydroxocobalamin | Cyanocobalamin |
| Folate Form | 5-MTHF (methylfolate) | Folinic acid | Folic acid (synthetic) |
| B6 Form | P-5-P (pyridoxal-5-phosphate) | Pyridoxal | Pyridoxine HCl |
| Best For | MTHFR variants, optimal absorption | General use | Budget (requires conversion) |
| MTHFR Safe | Yes — bypasses mutation | Mostly yes | No — cannot be converted by 40% of population |
Methylated B vitamins are in their active, bioavailable form — your body can use them immediately without conversion. About 40% of the population has MTHFR gene variants that impair conversion of synthetic folic acid to active folate. Methylated forms (methylcobalamin, methylfolate, P-5-P) bypass this issue entirely.
This is completely normal and harmless. Riboflavin (B2) is a bright yellow fluorescent compound. When you take more than your body needs, the excess is excreted in urine, causing the distinctive color. It's actually a sign your body absorbed the B vitamins and is eliminating what it doesn't need.
B vitamins support energy production, so morning dosing is generally recommended. Some people find evening B-complex disrupts sleep due to increased energy. However, B6 and B12 are involved in melatonin production, so individual responses vary. If evening dosing doesn't affect your sleep, it's fine.
Signs of B12 deficiency: fatigue, brain fog, tingling/numbness in extremities, balance issues, mood changes, and pale skin. At-risk groups: vegetarians/vegans (B12 is only in animal foods), adults over 50 (reduced absorption), and those taking metformin or PPIs (which deplete B12). A serum B12 test plus methylmalonic acid (more sensitive) can confirm.
Yes — B vitamins are water-soluble, meaning excess is excreted daily. No accumulation risk at standard supplement doses. The exception is B6 (pyridoxine): chronic doses above 100mg/day can cause peripheral neuropathy (nerve damage). The P-5-P form is safer at higher doses than pyridoxine HCl.
Apotheca is analyzing ingredient interactions, stacking compatibility, and timing recommendations for Thorne - Riboflavin 5'-Phosphate. This data will be available soon.
† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
