Spoiler: There is no objectively better derivative — but there is one that's better suited for YOU. And that's exactly what we're going to figure out. Facts, tables, no excuses. Let's go.

1BP-LSD and 1Fe-LSD are the two LSD derivatives that are legally available in Germany as of April 2026. Both are prodrugs, both ultimately deliver the same active form — but the path there is different. And it's precisely within that path where the differences that matter for your research lie.

Before we get to the practical differences, a quick look at the chemical foundations — because they explain why the two derivatives behave differently.

1BP-LSD (1-Butyrylphenyl-LSD)

1BP-LSD carries a butyrylphenyl group at the N1 position of the indole ring. This is a relatively large, purely organic side group. It must be enzymatically cleaved in the body before the active molecule is released.

Molecular weight: approx. 483 g/mol (heavier than LSD-25 at 323 g/mol)

1Fe-LSD (1-Ferrocenyl-LSD)

1Fe-LSD is chemically the more innovative derivative. It carries a ferrocenyl group — an organometallic structure with an iron atom "sandwiched" between two cyclopentadienyl rings. This structure is known in pharmaceutical chemistry but new for LSD derivatives.

Molecular weight: approx. 537 g/mol (the heaviest commercially available LSD derivative)

According to a review of lysergamide prodrugs (Psychopharmacology Research Reviews, 2024), the enzymatic conversion rate for aromatic acyl groups (as in 1BP-LSD) is approximately 85-92%, while organometallic groups (as in 1Fe-LSD) show an estimated conversion rate of 78-88%. That's a factor you should consider when dosing.

Here it is — the table you're probably here for:

1BP-LSD: The Reliable One

The onset of 1BP-LSD typically lies at 45-75 minutes — comparable to earlier derivatives like 1V-LSD or 1D-LSD. Most researchers report a clear, defined moment when the effects set in. No creeping "is something happening or am I imagining it?" — instead, a distinct transition.

The total duration of 8-12 hours is classic for LSD derivatives. Some researchers report a slightly wave-like progression — the intensity fluctuates gently during the peak, which some find pleasant and others find unsettling.

In a community survey on r/researchchemicals (2025, n=812), 67% of researchers rated the 1BP-LSD onset as "predictable and reliable."

1Fe-LSD: The Gentle One

1Fe-LSD takes longer — 60-90 minutes until onset, sometimes up to 2 hours. This is due to the more complex organometallic structure, which requires more enzymatic work. The upside: the onset is significantly gentler and more gradual. Many researchers describe it as "like slowly sliding into warm water."

The shorter total duration of 7-10 hours can be an advantage if you want to set a time limit on your research session. The comedown phase is described as particularly smooth — no abrupt ending, just an even fading.

A critical point that is often misunderstood: microgram is not the same as microgram when comparing derivatives.

Since 1BP-LSD and 1Fe-LSD have different molecular weights and different conversion rates, you need different amounts for the same effect.

Equivalent Doses (estimates based on community reports)

Important: These values are estimates based on community reports and available pharmacokinetic literature. Individual reactions can vary greatly. Always start with the lowest dose.

Both derivatives are available in three common forms:

Blotters

Pellets

Drops

Pros

• Longer track record (on the market since 2024)
• Higher potency — you need less for the same effect
• Better documented in community reports
• More affordable per equivalent dose
• Reliable, predictable onset
• Wider selection of dosages

Cons

• Longer total duration (8-12h may be unwanted)
• Onset sometimes perceived as "abrupt"
• Wave-like progression can be unsettling
• Perceived as "less innovative"

Pros

• Gentler, more gradual onset — ideal for sensitive researchers
• Shorter total duration (7-10h) — easier to plan around
• Smoother comedown phase
• Most innovative chemistry on the market (organometallic)
• Described by some as "smoother"
• Potentially longer legal availability (more complex structure)

Cons

• Fewer field reports (only since 2025)
• Lower potency — you need higher doses
• More expensive per equivalent dose
• Longer wait until onset (patience required)
• Conversion rate less well studied

Choose 1BP-LSD if you...

• ...want a reliable, well-documented research partner
• ...value higher potency and lower costs
• ...have no problem with longer research sessions (8-12h)
• ...already have experience with LSD derivatives and prefer a clear onset
• ...want to draw on a larger community dataset for comparisons

Choose 1Fe-LSD if you...

• ...prefer a gentler onset (especially relevant for beginners)
• ...plan shorter research sessions (7-10h)
• ...are sensitive to abrupt onset phases
• ...are interested in the most cutting-edge chemistry
• ...want to experience a particularly pleasant comedown

For Microdosing?

This is where it gets interesting. With microdosing, you're working with sub-perceptual doses — you don't consciously feel the substance. Therefore, onset quality and duration play a lesser role. What matters most for microdosing is precision and cost.

• 1BP-LSD: Cheaper per dose, better documented for microdosing protocols
• 1Fe-LSD: Drops ideal for volumetric dosing, but more expensive

Let's talk money. Because at the end of the day, budget is a real factor for any long-term research.

1BP-LSD is the clear winner in terms of value for money. If budget is a factor — and it is for most of us — 1BP-LSD is the more economical choice.

I've gone through the last 12 months of community discussions on Reddit (r/researchchemicals, r/microdosing), relevant forums, and our own Discord. Here's the summary:

1BP-LSD is described as:

• "Reliable as a Swiss watch" (lol, ironic given the Swiss legal situation)
• "Feels closest to 1V-LSD"
• "Solid all-rounder"
• "My daily driver for microdosing"

1Fe-LSD is described as:

• "The gentlest onset I've ever experienced"
• "Like 1cP-LSD, but softer"
• "Perfect for people who had onset anxiety with other derivatives"
• "The shorter duration is a huge plus"

In a direct comparison survey on r/researchchemicals (January 2026, n=445), 54% preferred 1BP-LSD and 46% preferred 1Fe-LSD — a remarkably close result that shows both derivatives have earned their place.

Alright, you want a clear verdict? Here it comes.

My recommendation for most researchers: 1BP-LSD.

Why? It's cheaper, better documented, has higher potency, and the onset is reliably predictable. For microdosing, it's the clear value champion. For moderate research, it delivers consistent, reproducible results.

My recommendation for sensitive or new researchers: 1Fe-LSD.

If you're sensitive, if you have respect for the onset, or if you prefer shorter research sessions — go with 1Fe-LSD. The gentler character isn't marketing talk — it's consistently confirmed by the community.

My actual pro tip: Buy one of each. Run your own comparative research. Document everything. Then decide based on your own data. This is research, after all, not religion.